Jellyfish as a species are actually older than dinosaurs and sharks.
383
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
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
Penguins have a gland above their eye that turns saltwater into freshwater.
12
In 2011, a male tiger in India adopted a litter of orphaned cubs, taking on the role of ‘mother’. Wildlife officials say such behavior had never been observed before.
9
A cow produces around 200,000 glasses of milk in her lifetime.
373
A domestic cat can sprint at about 31 miles per hour.
274
Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
10