Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Bats sleep 18-20 hours per day.
5
A lion in the wild usually makes no more than twenty kills a year.
186
In 2005, in Africa, it was reported that three lions rescued a 12-year-old girl from kidnappers and guarded her for half a day until help came.
46
Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
57
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6