Unsinkable Sam (nickname of a German ship's cat) who served on 3 warships, one German, two British, all sank in action. The cat survived each sinking, floating away on wooden planks to rescue.
19
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Condoms were originally made of animal intestines or linen.
347
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20
In 1918, a homing pigeon saved over 190 American soldiers by delivering a message to nearby support despite having been shot through the breast, blinded in one eye, covered in blood, and with a leg hanging on by just a tendon.
22
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25