Study: Mass Extinctions Lead To Small Creature Dominance

An expansive study of fish fossil records found that a mass extinction event led to the prevalence of tiny fish in the oceans for at least 40 million years afterwards.

When larger species die out, smaller ones fill the void. 
According to a study published in Science, that void stays filled with those smaller species for some time thereafter. 
Lead researcher Lauren Sallan, from the University of Pennsylvania, noted, “Rather than having this thriving ecosystem of large things, you may have o