One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
Cats and dogs can hear ultrasound.
350
Denmark has twice as many pigs as there are people.
66
Termites are being researched as a possible renewable energy source as they can produce up to 2 litres of hydrogen from ingesting a single sheet of paper, making them one of the planet’s most efficient bioreactors.
24
Alligators can live up to 100 years.
337
Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
57