Kangaroos have no reverse gear — their spring-like hind legs can't move independently and their muscular tail works as a fifth leg that only pushes them forward.
What you'll learn:
- A kangaroo's hind legs move in perfect sync, so stepping backwards is mechanically almost impossible.
- Scientists found the tail acts as a literal fifth leg, producing as much forward power as the other four legs combined.
- Australia's coat of arms pairs the kangaroo with the emu — two animals chosen to symbolise a nation that never steps backwards.
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