A banana slug can be 6-8 inches and their erect penis can be just as long. Also, their penises emerge from their heads. After sex, banana slugs eat each others penises.
17
There was a bear called Wojtek who was adopted by Polish soldiers during WW2. It carried ammunition, wrestled with soldiers, and drank beer.
40
False teeth are often minutely radioactive.
214
It 'snows' metal on Venus.
13
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
There is a family with a genetic condition that makes their skin blue, who have been isolated in rural Kentucky for generations.
34
Giant Anteaters' front legs look like a panda.
48