The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
79
Moths are unable to fly during an earthquake.
328
Dolphins have names for one another.
18
In 1955, the citizens of São Paulo were so upset with their government that they elected a rhinoceros named Cacareco (meaning rubbish) to the city council in protest, with over 100,000 votes.
18
The largest earthworm on record was found in South Africa and measured 22 feet.
151
Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10
Cats and dogs can hear ultrasound.
350
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23