A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Only 3% of bird species have penises.
0
Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
16
15% of snails survive digestion by birds and are found alive in their droppings, potentially leading to the spread of snail populations.
1