Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
Tigers can see 6 times better at night than humans.
305
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
There's a competition in Sweden called Kaninhoppning, or rabbit show jumping.
-12
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9