Last updated at 17:05 BST, Wednesday, 11 September 2013
The word alligator comes from the Spanish 'el lagarto', which means 'the lizard'.
It's thought early Spanish explorers to Florida gave the creatures this name.
A muscle is in fact a little mouse, if you trace the word back to its Latin origin 'musculus'. Flexing a muscle was thought to look like a little mouse running beneath your skin.