8. Black Swallower
And I thought snakes were weird for swallowing their prey like that… The Black Swallower is a deep-sea creature that can consume other fish by sort of collecting them into its giant expendable stomach. Sounds like a horror movie script? This 45 cm long fella can eat fish that are even 10 times larger than him simply by swallowing them slowly digesting them. In fact, sometimes the prey is so large that it actually starts to decompose in the stomach of the fish before the digestion process actually ends. Wow.