5 mind blowing octupuses (it turns out octopi is actually incorrect!)

1. All species are venomous, but the blue-ringed octopus is the only one dangerous to humans, responsible for at least two deaths!

2. Octopuses are about 90% muscle!

3. Because they don't have bones, even large octopuses can fit through an opening the size of a quarter.

4. An octopus has 3 hearts.

5. Octopuses inject their prey with venom using a beak similar to a bird's made from the same tough material as a lobster shell.