There are approximately three chickens for every human on Earth.
13
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
Only 3% of bird species have penises.
0
Domestic pigs average a top speed of about 11 miles per hour.
182