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From dense forests to icy landscapes, witness the revival of wildlife as rewilding efforts bring nature back to its former glory across vast European regions.

在伊比利亚半岛各地,食物链和生态系统正得到恢复,使得包括世界上最稀有的猫科动物——伊比利亚猞猁在内的众多濒危动物得以再次繁衍生息。在葡萄牙的科阿河谷(Coa Valley),古老物种的引入正在改变当地的景观,并预示着该地区顶级捕食者的回归。

Category

🐳
Animals
Transcript
00:03Europe, a continent renowned for its spectacular cities and civilizations.
00:10But this is a surprisingly wild land, with over 10 million square kilometers of diverse natural habitat.
00:20Stretching from the northernmost reaches of the Arctic,
00:24to the crystal clear waters of the Mediterranean Sea,
00:30and across this extraordinary continent, an epic transformation is underway,
00:37as the wild heart of Europe is unleashed once more.
00:46People are supporting the natural world.
00:48Let's go to the nest and see how the chickens.
00:53Species are being reintroduced.
00:55It's not sleeping very well, so we have to be really fast.
01:00And nature itself is bouncing back.
01:06The circle of life is being reforged, as the wild returns to Europe.
01:16In Spain and Portugal, an astonishing project is underway.
01:22To reverse the effects of a centuries-old extinction.
01:28And secure the future of one of the rarest cats in the world.
01:32Here, in Europe's new wild.
01:44Iberia, bordered by the Atlantic Ocean and the Mediterranean Sea.
01:52On the west coast of Europe, this vast peninsula is home to Spain and Portugal.
02:02As well as some of the most diverse landscapes on the continent.
02:11Scores of unique species live here.
02:14Scores of unique species live here.
02:17Its national parks host millions of migrating birds and hundreds of mammals.
02:28including the rare Iberian wolf
02:37as well as the most endangered cat in the world the elusive Iberian Lynx these cats
02:49are known for their black ear tufts and their long cheek fur called ruffs
03:03especially adapted to Iberia's dry arid landscape the lynx's sandy coat allows it
03:09to camouflage amid brush and rock links are generally nocturnal but in the winter
03:19these solitary cats become active during the day
03:26a highly effective predator its hearing is eight times sharper than a human's and its large eyes
03:35allow it to see well night and day advantages it uses to stalk its prey
03:54European rabbits evolved here in the Iberian Peninsula and many of the region's predators
04:01specialize in hunting them
04:15they're a lifeline for hungry hunters
04:23but in the northern peninsula like other parts of Europe there's a place where the predator prey
04:28balance has been disrupted
04:33where the circle of life has been broken and where the lynx has not been present for many years
04:42the Coa Valley in Portugal lies nestled between the Douro River and the Malkata Mountains
04:50its dramatic river gorges and vast grasslands may look vibrant
04:57but as the land degraded many animals disappeared from the area
05:03and predators are rarely seen
05:07the Coa Valley is ripe for rewilding
05:18helping native species return
05:22so nature can take care of itself
05:25and work as it's meant to
05:29in Portugal efforts began in the valley's fire brava reserve
05:36Pedro Prater is a conservation biologist the rewilding Portugal team leader
05:43what we want to achieve is a habitat where wildlife is abundant in prey and predator and scavengers and can
05:50be commonly seen in this landscape
05:54Pedro and his team are on an urgent mission
05:57to start building from the ground up
06:00to start building from the ground up and transform the land
06:03and lure back wildlife like the Iberian lynx
06:15the key to this transformation
06:18is grazers and prey animals
06:24like those in Spain's Doñana National Park
06:28here large herbivores like red deer help shape the landscape
06:33their constant grazing creates open meadows
06:38which makes food available for smaller animals
06:47female red deer gather at the best grazing sites
06:50where food is plentiful
06:54in mating season
06:55savvy males seek out these open meadows
07:06the dominant male tries to round up fertile females
07:10to create a harem
07:21he's persistent
07:30roaring to show his dominance
07:37and flicking his tongue
07:39to catch scent of their pheromones
07:52his roaring is a warning to other mature males
07:55and potential competitors
07:59finally
08:00his hard work pays off
08:08in the Koa Valley
08:10the loss of wild herbivores
08:12has had a huge impact
08:13and now livestock herds
08:16are vanishing too
08:19just like deer
08:20livestock animals graze constantly
08:26in the wild
08:27each sheep
08:27eats about 2% of its body weight
08:30per day
08:36which means they spend most of their life
08:39tucking into greenery
08:47this constant eating
08:48eventually creates open spaces
08:53which can provide micro habitats
08:55for other animals
09:01but as domestic animals disappear from the landscape
09:06brush and scrub quickly takes over
09:16the Koa Valley
09:18the Koa Valley
09:18has some of the highest rates
09:19of land abandonment in Europe
09:22as farmers left the countryside
09:24to start lives in the city
09:26livestock disappeared
09:30land that was once clear
09:32transformed
09:33the dense shrubs and bushes that grow back
09:36limit the variety of plants and trees
09:39the trees that can grow
09:40and that leads to less wildlife
09:47it also produces dry brush
09:50which helps fuel devastating wildfires
09:55like the one in southern Spain
09:59in June 2017
10:02a forest fire began near Doniana National Park
10:07it quickly spread
10:12firefighters tackled the blaze throughout the night
10:20but by daybreak it was clear they were losing the battle
10:28the El Asabuche lynx breeding centre
10:31stood directly in the fire's path
10:35it's one of five lynx breeding centres in Iberia
10:39in the year 2002
10:41there were only 94 Iberian lynx left on the planet
10:46the Spanish government started a program to breed cubs
10:50that could be released to live wild
10:52and save the cat from extinction
10:57as the fire approached
10:58staff at the breeding centre
11:00took the unprecedented decision
11:03to evacuate the lynx
11:06the cats
11:07the cats are housed in individual dens
11:11they have limited contact with people
11:13so they're cautious
11:16which makes catching them difficult
11:27among the cats evacuated
11:29the cat
11:29were Homer
11:29and her two five-week-old cubs
11:38staff managed to catch the three
11:40and move them to safety outside the fire zone
11:54after burning for three days
11:56the fire was finally brought under control
12:00forest fires are natural processes
12:06but this fire's intensity
12:08was fuelled by an ungrazed landscape
12:18fortunately the breeding centre was spared
12:21but not all of the evacuated lynx
12:24survived the ordeal
12:27in the aftermath of a 2017 wildfire
12:31in southern Spain
12:32staff returned to the Iberian lynx breeding centre
12:35and to devastating news
12:39one of the lynx, Homer
12:40died in transit
12:43already weak after giving birth to cubs
12:45the stress of the move proved too much for her
12:50Paco Villaspesa
12:52is the director of the breeding centre
13:01Homer's two little cubs
13:03Oslo and Opelano
13:05lost her at a very vulnerable age
13:13If her cubs are hand fed, there's little chance they can live wild, and they'll spend their lives in captivity.
13:30This meant the cubs still had a chance of living wild.
13:38Iberian lynx generally give birth between March and April.
13:46The average litter size is three, but rarely do more than two cubs survive weaning.
13:54They stay with mom until they're about ten months old.
13:58And they spend most of the time playing.
14:08It may look like fun and games.
14:12But this helps the cubs develop skills they need in the wild.
14:18Play between siblings strengthens their social bonds.
14:24And develops physical abilities for breeding and hunting.
14:41At four weeks old, cubs start eating meat.
14:46A lynx needs between 600 and 1,000 calories a day.
14:52About the same amount of energy contained in a single rabbit.
14:59A mother lynx will need to catch several rabbits each day to feed herself and her cubs.
15:13They may be small, but rabbits prop up the entire ecosystem.
15:20Their grazing clears the ground so new plants can grow.
15:28Rabbits also make a tasty meal for a range of Iberian predators.
15:36So their excellent hearing, which captures sound from up to three kilometers away,
15:42comes in handy when hungry wolf and fox are nearby.
15:55As well as the Spanish imperial eagle, which favors anywhere with rabbits.
16:04Just like the lynx, more than half of the eagle's diet is rabbit.
16:12The eagle is one of Iberia's many predators that rely on rabbits to survive.
16:28But then, the rabbit population crashed.
16:33Rabbits were once so numerous across Europe, they became an agricultural pest.
16:39So humans introduced a virus, myxomatosis.
16:44It ran out of control and killed 90% of Europe's rabbits.
16:50Carnivores like the imperial eagle started taking other prey.
16:56But not all predators could adjust, and their numbers plummeted.
17:04To lure predators back to the Koa Valley, the area needs rabbits.
17:15Rather than reintroducing them, Pedro wants to build up the existing population.
17:20One that has an inbuilt resistance to the deadly virus.
17:24But even estimating the Koa Valley's rabbit population is a challenge.
17:30So, there's some droppings of rabbit.
17:35And only a few, so it's recent.
17:39It's an important discovery, proof that rabbits are in the area.
17:44See?
17:45So, this would be an adult, and this would be a younger one.
17:48See, different ages.
17:51A potential den site nearby explains why.
17:55There's rocks, loose rocks, there's brambles and bush,
17:59until they can do their borrows and breed.
18:02To encourage the rabbits to breed, Pedro builds them shelters.
18:08These provide safe spaces for rabbits to hide from predators and raise their young.
18:17Camera traps will catch any animals that come to the site.
18:26It's a start, and a promising one, because these guys breed like rabbits.
18:35Other species make use of the shelters.
18:38They're ideal perches for birds.
18:42And the perfect resting spot for nighttime hunters.
18:52Two species of hedgehog make their home in Iberia.
18:58These solitary, nocturnal omnivores cover more than a kilometer a night foraging for food.
19:09They're covered in thousands of sharp spines.
19:13Hollow hairs, which are their defense against predators.
19:20Relying on their senses of smell and hearing.
19:24They search for invertebrates like slugs and snails.
19:32Which make a tasty midnight snack.
19:47In southern Spain, two cubs orphaned by the wildfire urgently need the care of an adult lynx.
19:56But with no female available to take them on, the team makes an unprecedented decision.
20:04A male lynx has never been known to raise cubs.
20:09But the team plans to place the little cubs with their father, Esparto.
20:15Hoping he'll step up and care for them.
20:18They just need to wait for the right moment.
20:23The breeding center's goal is to avoid hand raising the cubs.
20:28So they can live wild one day.
20:32While the lynx are prepared for a life in the wild.
20:36The wild also needs to be prepared to support them.
20:44A key measure is preventing wildfires.
20:48Portugal has one of the highest forest fire rates in Europe.
20:53In Iberia's dry, hot summers, this vegetation becomes a tinderbox.
21:00But local groups fight fire.
21:04With fire.
21:07Strategic areas are burned to create fire breaks.
21:12These controlled burns produce ten times less heat than wildfires.
21:17Meaning that plant roots and soil remain undamaged.
21:24While dry and dense vegetation is burned away.
21:33Burning brings other benefits to the land.
21:37As wildlife technician Jao Quadrado explains.
21:41This will become like noasis for wildlife.
21:45These burns increase biodiversity by making space for new species to grow.
21:53Just a few weeks after the fire.
21:55We already can see some vegetation growing up.
21:58Roots and the water that's in the ground.
22:01It's completely untouched and available for the plants to grow fast.
22:09Controlled burns protect and revitalize small patches of land.
22:18But larger areas need a different approach.
22:23Big herbivores, like those in Iberia's national parks.
22:28To eat the scrub and clear the land.
22:30Creating natural fire breaks.
22:36Garano wild horses.
22:38An ancient local breed.
22:39Were reintroduced by rewilding Europe.
22:42And now 30 roam the Coa Valley.
22:53Along with grazing unwanted scrub.
22:55They also provide soft benefits.
22:58Which can unleash a chain reaction.
23:06Using its powerful sense of smell.
23:08This dung beetle locates fresh horse droppings.
23:12And rolls it into balls.
23:18Often transporting more than a thousand times its own body weight.
23:22The beetle moves the ball over vast distances.
23:30Leaving behind seeds as he goes.
23:36He buries the dung ball.
23:38Which fertilizes the soil.
23:41And helps other plants to grow.
23:46Insects are essential for a healthy ecosystem.
23:49And for many of the peninsula's predators.
23:57Like Iberia's little owl.
24:06These tiny owls.
24:0820 centimeters tall.
24:10Favour open countryside.
24:15She hunts in daylight.
24:17Perching up high.
24:18To scan the ground below.
24:19For small mammals and insects.
24:23She needs to be alert.
24:25When there's a hungry brood to feed.
24:29Little owls lay their eggs in tree hollows.
24:33Chicks hatch a month later.
24:35And within weeks.
24:36Gather at the nest's entrance.
24:38Calling for food.
24:42They won't fledge until they're a month old.
24:45And aren't independent till a month after that.
24:53Until then.
24:54They rely on their parents for food.
24:57At any time of day.
24:59Or night.
25:05Dinner.
25:07At last.
25:09And it's delicious.
25:16Dinner.
25:24At last.
25:26And it's delicious.
25:27The animal team.
25:27Is helping creatures.
25:29Return to the area.
25:33Artificial ponds.
25:34Have been established.
25:35Throughout the reserve.
25:39These provide water for thirsty animals.
25:42And habitats for others.
25:51Amphibians and insects.
25:52Are attracted to the humid moist conditions.
26:00And the plant life that thrives on the edge of the pond.
26:05Which is ideal for the local frogs.
26:10They can chill out.
26:14And catch a meal with minimal effort.
26:20Along with the usual suspects.
26:23These small but essential.
26:25Bodies of water.
26:27Support a range of birds.
26:37Who can prey on the pond's inhabitants.
26:47By bringing animals back to the Coa Valley.
26:50Natural processes can begin to work again.
26:55The wild horses.
26:57That the rewilding Europe team has introduced.
27:01Are already transforming the landscape.
27:03With their appetites.
27:05Of course.
27:06But they need more muscle.
27:08And more mouths.
27:11So science.
27:12Is turning to a once extinct species.
27:16At the Coa Museum.
27:18Copies of cave art.
27:20Show the aurochs.
27:21An extinct wild cow.
27:23Which once shaped the landscape.
27:25Of all of Europe.
27:26What you see here actually.
27:28Is a pretty good representation.
27:29Of what an aurochs was.
27:31It was a huge animal.
27:33They also had this.
27:34Typically curved back.
27:36With a white stripe.
27:38We think the animals.
27:39Were a bit more slenderly built.
27:41Because they were made for running.
27:43Hunting and habitat loss.
27:45Pushed these creatures.
27:46To remote European forests.
27:49Where the last aurochs died.
27:50In 1627.
27:55But traces of their DNA.
27:58Were left behind.
27:59And with it.
28:00Scientists had a chance.
28:02To create an animal.
28:03That resembled the aurochs.
28:06There are so many aurochs.
28:08Skeletons.
28:08Everywhere.
28:09In Europe.
28:10Where you need.
28:11To have.
28:12High quality.
28:13Ancient DNA.
28:14And they found.
28:15A skeleton in a cave.
28:16In the UK.
28:17Which was.
28:18Where the bones.
28:19Are very good conserved.
28:20And they could extract.
28:22Quite a good.
28:22Amount of DNA.
28:24Bones from an.
28:258000 year old.
28:27Auroch skeleton.
28:28Was sequenced.
28:29To extract DNA.
28:31The genetic material.
28:33Revealed.
28:33Can then be compared.
28:34Against DNA samples.
28:36From modern breeds.
28:36Of wild cows.
28:40This way.
28:41Scientists can find.
28:43Different breeds.
28:44That have similar traits.
28:45To the aurochs.
28:46So if you want.
28:47To go back.
28:48To an extinct species.
28:49You want to go.
28:50And look.
28:51For all the.
28:52The traits.
28:53Horn size.
28:54Coat colors.
28:55And then we.
28:56Going back.
28:56To the traditional breeds.
28:57The primitive breeds.
28:58If they have.
28:59Also ancient look.
29:00They also have.
29:00Ancient material.
29:01And then we say.
29:02Okay.
29:02This breed has.
29:03This.
29:04Nice horns.
29:05Which is interesting.
29:05And if we use.
29:06That breeds.
29:07We can use it.
29:08With this.
29:08And this.
29:08And this breeds.
29:09Of course.
29:09This has a nice.
29:10Skin color.
29:11Another one.
29:12Has a nice.
29:13Hair color thing.
29:14The other one.
29:14Has the height.
29:15Which is very nice.
29:19To all these kind of things.
29:20We try to combine them.
29:22And then we can make crosses.
29:26The goal is not to create back.
29:27There are rocks.
29:29But to create.
29:30Or to.
29:30Bring back.
29:31An animal.
29:32Which is self-sufficient.
29:33Detectives.
29:34Like.
29:41Besides.
29:43To.
29:43To.
29:43To.
29:43A.
29:44A hundred kilometers.
29:45Outside.
29:45Amsterdam.
29:46Scientists.
29:47Are.
29:47Rebuilding.
29:48This.
29:48Extinct.
29:49Species.
29:52By crossbreeding.
29:53Cattle.
29:53That carry.
29:54Aurox.
29:55Genes.
29:56They're creating.
29:56A new.
29:57Breed.
29:57Of.
29:57wild cow the Toros there's still a quite a few of cattle breeds around with a lot
30:05of features of ours we try to find those breeds and get them breeding together to
30:10find the way back to an animal that looks as much as on our rocks as could
30:15be with their massive appetites they eat nearly 10 kilos of vegetation per day
30:22and they're just what the Coa Valley needs rewilding Portugal already introduced 20 of them and with
30:36wild births there are now 35 Toros living in large corrals while the plan is to release them to a
30:47wider area the corrals are an opportunity to see how Toros impact the landscape
31:03this is the change in one small area in less than a year
31:13and this new patchwork landscape provides niches for many different animals like the partridge the
31:24red-legged partridge is a key species in this ecosystem it needs a varied habitat brush and
31:32bushes where it can hide from predators and make ground nests to lay eggs and also dry open areas
31:42to feed on seeds and insects Sara Cascado studies the Coa Valley partridge population it's a key food
31:57source for many of Iberia's predators partridge together with rabbit they have many different
32:03animals praying on them so they are key in the food chains we really need to have a healthy population
32:10of
32:10partridges for the rest of the ecosystem to be healthy too so Sara and her team set out to create
32:18a
32:18partridge census which is easier said than done partridge numbers here hello the birds are elusive
32:36so Sara must use every trick at her disposal she follows any lead from prints in the sand the partridge
32:46calls we spoke like we observe individuals and count them and identify the age and also we listen
32:55like try to identify that the songs listen to the songs and also determine the number of individuals like
33:00that it's a very important way to verify the conservation actions and also to understand
33:07how the changes in the population can affect also the population of raptors herbivores reintroduced here are
33:15also doing their part for the partridge population these animals help out reducing the amount of
33:21vegetation that could potentially burn in case of a fire they also help maintaining open areas then
33:28partridges can can use for feeding partridge here once relied heavily on cereal crops but as farmers left this
33:38food source disappeared and as partridge numbers dropped predators like Fox and Eagles had less to feed on
33:54so did the links links mothers must hunt for themselves and their young they need large territories to find
34:05enough prey even then keeping cubs fed is a full-time job and a chance for the little ones to
34:18learn
34:29watching her hunt is a masterclass
34:41as they look on she silently stalks her prey
34:49until it's finally in reach
34:53then she pounces
34:58killing it with a single bite to the neck
35:10back in Spain two little cubs who lost their mother urgently need an adult lynx to care for them and
35:17teach them otherwise they'll have to be raised by humans and that means they'll never live wild but with no
35:26adult females available staff come up with a remarkable plan
35:30for the first time for the first time ever lynx cubs will be placed with their father
35:44the team has no idea how the cubs father esparto will react he could accept them or reject them
36:03but he bonds with them instantly
36:06and for the first time ever a male lynx is seen parenting his offspring and he takes the job seriously
36:29hunting is a key skill for captive lynx
36:41learning to hunt is a long process even with an adult around
36:50at first they seem intimidated by the prey
37:00then they try to master the art of ambush
37:05which doesn't go very well at first
37:12and even when they manage to get close
37:15they come out empty-handed
37:20the rabbit doesn't even look worried
37:26it will be a while before these guys can catch a meal
37:29it will be a while before these guys can catch a meal
37:36back in the koa valley another species needs help finding food
37:42vultures nest on steep cliffs like these
37:46they're perfect for catching rays
37:53and hiding precious treasure from predators
38:01here on the cliff's ledges
38:04vultures lay a single egg
38:06and tenderly nurture their offspring
38:21chicks exercise their wings in preparation for fledging
38:27which they'll do between three and four months of age
38:33but it's never too early to start practicing
38:38but there's a problem
38:42without any predators around to make kills
38:46there's not enough food for the vultures to scavenge
38:50so the rewilding team sets up temporary vulture restaurants
38:55to help the vultures until wild prey and predators return
39:02it may look chaotic but there's a rigid pecking order
39:08larger vultures open up the carcasses allowing smaller birds to feed
39:16their table manners may leave something to be desired
39:21but everyone is fed
39:25until predators return to the koa valley these restaurants ensure the vultures future
39:34it's not just scavengers that need predators
39:38oak forests rely on them to grow
39:42in autumn oak trees produce acorns that fall to the base of the tree
39:54they don't go to waste
39:57if there are no predators about the western mediterranean mouse gobbles them up where they find them
40:04they don't go to the top of the tree
40:21but if predators are in the area
40:27the mice take the acorns far away to eat them in safety
40:31and bury them in burrows
40:38these acorns can grow into oak trees a great distance away from where they fell
40:47named for their thick bark cork oaks are native to this region
40:52and portugal is home to the largest cork oak forests in the world
41:01cork is more fire resistant than normal bark
41:04so these trees are natural fire breaks
41:09they also support more than 200 animal species
41:21and dozens of plants
41:23a cork oak is an ecosystem in itself it arbors many different species
41:30lots of bird species use it to nest
41:32there's all the different crevices of the cork and the root system and the foliage and that
41:41makes different niches for species to thrive
41:44by protecting cork trees rewilding teams shield the region and its animals from fire
41:52helping avoid its devastating effects
41:56in the nine months since the wildfire in southern spain
42:00the land is showing signs of recovery
42:05a 10-month-old cub apilano taught by his father he's now a hunter
42:24he can feed himself
42:30it's time to be set free
42:38across europe efforts are underway to rewild huge areas of the continent's most important habitats
42:47allowing key species to return
42:57and the lynx breeding center in spain
43:00cats ready for release undergo a health check to ensure they won't pass on any illnesses to wild lynx
43:10to track their movements they're fitted with a gps collar
43:17opilano the cub who lost his mother in the wildfire has a clean bill of health and is ready for
43:23release
43:26but his brother oslo fails the test forcing him to stay behind at the center
43:33once they're freed links can travel great distances
43:39like kentaro a male lynx that was released in 2014
43:46where he began an epic journey of nearly a thousand kilometers
43:53one of his last locations was the koa valley
44:05kentaro's visit here brings hope that links could one day resettle the area
44:15but despite such a promising start things didn't end well
44:22just nine months after his journey to the koa valley
44:26kentaro was struck by a car and killed
44:33traffic is one of the leading causes of death for the iberian links
44:42but there's hope
44:46pedro and his team are setting up new rewilding zones in the koa valley
44:54this network of protected areas near fire brava will allow a host of animals to safely migrate
45:00settle and breed this year the koa valley rewilding area is increasing by 300 percent to more than 120 000
45:11hectares
45:27in the hope that one day this elusive cat
45:32resettles the koa valley
45:45in southern spain
45:47in southern spain months of hard work are about to pay off
45:49as crowds gather to witness the release of an iberian lynx
46:00opilano the cub who lost his mother in the wildfire is being freed just like hundreds of captive
46:07bread links before him
46:10it's a moment of satisfaction when it's open the trap trap and it's liberated from nature
46:34Opelano is free, another player restored to Iberia's ecosystem.
46:58When we started working in 2003, we had planned that for 2018 we had to have released about 112
47:05exemplars.
47:08Now, we practically duplicate that number, so we are very happy with the results obtained.
47:13One of the most successful wildlife reintroduction programs in the world.
47:20Now with nearly 600 Iberian links, their conservation status has downgraded from critically endangered
47:27to endangered.
47:35For me rewilding is a positive outlook into the future.
47:39It brings a new hope, a new perspective that we are not just trying to slow down decline,
47:45but actually to provide means and opportunity to reverse that trend.
47:50I think as a human it brings the dignity back to the equation.
48:11To order Europe's New Wild on DVD, visit ShopPBS or call 1-800-PLAY-PBS.
48:17ShopPBS.
48:17Also available on Amazon Prime Video.
48:22ShopPBS.
48:23ShopPBS.
48:27ShopPBS.
48:28ShopPBS.
48:29ShopPBS.
48:30ShopPBS.
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Ecosystems, Nature, Cat, Landscape, Wildlife, 濒临灭绝, 复兴, 欧洲, 栖息地, 森林, 野生動物,

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