- It is one of the most pacifistic mammals.
- It can erect the spines on its body and withdrawn its arms and legs to protect itself.
- It has rows of spikes on its tongue instead of teeth.
- The male has a four-pronged penis - have a look.
- It swims with its eyes, ears, and nostrils closed, relying on electrosensory receptors to catch prey.
- It eats half its body weight each day and stores excess fat in its tail.
- The webbing folds under its feet to expose individual nails that allow them to run on land.
- The male is equipped with a venomous spur that can deliver enough poison to kill a dog - see it here.
- When the first specimen was brought to Europe, it was believed to be a hoax.