The Basenji dog is the only dog that is not able to bark.
4
Cats and dogs can hear ultrasound.
350
It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
492
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
Giant Anteaters' front legs look like a panda.
48