A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The largest breed of rabbit is the Flemish Giant.
65
It is possible for a scorpion to sting itself to death as they are not immune to their own poison!
39
A rat can go without water longer than a camel can.
26
Koala Bears are not bears.
34
A full-grown bear can run as fast as a horse.
35
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
Whales and dolphins can't taste anything other than salt.
11