Catgut comes from sheep not cats.
Frogs sometimes eat enough fireflies that they themselves glow.
Dogs have four toes on their hind feet, and five on their front feet.
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.
An eagle can attack, kill, and carry away an animal as large as a small deer.