Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20
A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The elephant brain weighs about 6,000g.
274
An average cat has 1-8 kittens per litter and can have 2-3 litters per year. During her productive life, one female cat could have more than 100 kittens. A single pair of cats and their kittens can produce as many as 420,000 kittens in just 7 years.
10
Female kangaroos have three vaginas.
2