Cats and dogs can hear ultrasound.
350
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
When cats are happy, they may squeeze their eyes shut.
10
Tigers can see 6 times better at night than humans.
305
Alligators can live up to 100 years.
337
Sharks, like other fish, have their reproductive organs in their chests.
248