Billy goats urinate on their own heads to smell more attractive to females.
31
Crocodile babies don't have sex chromosomes; the temperature at which the egg develops determines gender.
45
Anteaters prefer termites to ants.
18
An ostrich's eye is bigger than its brain.
32
A duck's quack doesn't echo, and no one knows why.
173
The average city dog lives three years longer than the average country dog.
38
Eagles mate while airborne.
44
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20