When cats are happy, they may squeeze their eyes shut.
10
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
A group of unicorns is called a blessing.
304
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
Alligators can live up to 100 years.
337
Cats and dogs can hear ultrasound.
350
Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
16