A blue whale's aorta (the main blood vessel) is large enough for a human to crawl through.
52
Humans and dolphins are the only species that have sex for pleasure.
61
Cats recognise the voice of their owner, but never evolved to care.
22
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
If NASA sent birds into space they would soon die; they need gravity to swallow.
146
Ants don't sleep
15
By feeding hens certain dyes they can be made to lay eggs with multi-colored yolks.
40
The elephant brain weighs about 6,000g.
274