Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
Only 3% of bird species have penises.
0
A scorpion can hold its breath for up to 6 days.
19
Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
12
The most expensive cow in the world was sold in 2009 for $1.2 million.
-3
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
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20