The elephant brain weighs about 6,000g.
274
Hummingbirds can't walk.
32
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
Parrot parents "name" their children with a signature call.
112
A 42-foot sperm whale has about 7 tons of oil in it.
209
A dragonfly has a lifespan of 24 hours.
24
Cats recognise the voice of their owner, but never evolved to care.
22
A dairy cow can produce more milk when listening to music.
446