Are the kings of the sea. Best animal I've ever seen. Look at this shit:
http://theoatmeal.com/comics/mantis_shrimp
1. They see 16 different colors whereas we only see 3 and all variances of the 3.
2. One of the most violent sea creatures, instantly attacking any other creature who approaches their lair. They also go out on hunts unlike other crustaceans.
3. Two raptorial appendages on the front of its body known as "murder sticks". These things pop loud and can shatter aquarium glass easily.
4. Moves quickly and exerts force using supercavitation, which it can use to push other creatures away and in some cases, kill them.
5. Produces tiny bursts of light through a process called sonoluminescence.
And the final bit:
Despite seeing a vast rainbow of colors and a very interesting beautiful world, this creatures decides to live in a cave, look awesome, and kill everything else that comes near it. That's awesome.
Rape clips of this monster in action:
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