2. The Echiura: Also known as the spoon worm, it burrows in the mud and makes tunnels which is where it got its nickname. Other animals can often be found living in the tunnels as well.
3. The Atlantic wolffish: If you thought piranhas were the only small sized fish with teeth to look out for, think again. Now you have wolffish to worry about! Nicknamed seawolf, devil fish, and wolf eel, this bottom feeder is actually not harmful to other fish at all. Their large jaws are used to eat hard shell creatures such as mollusks. Their diet helps control green crab and sea urchin populations. Unfortunately the wolffish population is rapidly decreasing due to over-fishing. It is considered an endangered species.