Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
10
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
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
The most expensive cow in the world was sold in 2009 for $1.2 million.
-3
Penguins have a gland above their eye that turns saltwater into freshwater.
12