A lion in the wild usually makes no more than twenty kills a year.
186
Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
17
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
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
Cats and dogs can hear ultrasound.
350
The Basenji dog is the only dog that is not able to bark.
4
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2