Catgut comes from sheep not cats.
11
Frogs sometimes eat enough fireflies that they themselves glow.
71
The seahorse is the only fish to have a neck.
12
Dogs have four toes on their hind feet, and five on their front feet.
179
An ant brain has about 250 000 brain cells. A human brain has 10,000 million so a colony of 40,000 ants has collectively the same size brain as a human.
118
An eagle can attack, kill, and carry away an animal as large as a small deer.
38
Some lizards, in which the tail is a major storage organ for accumulating reserves, will return to a dropped tail after the threat has passed, and will eat it to recover part of the sacrificed supplies.
13