The Basenji dog is the only dog that is not able to bark.
4
Denmark has twice as many pigs as there are people.
66
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212