marine mantis

-Humans see three colors (green, blue and red), butterflies 5 but marine mantis can see up to 17. Maybe that has those colors.

-But still is the harbinger of death, any creature you see, she attacked.
-It has two sharp appendages moving at the same speed as a bullet fired from a .22 caliber rifle (1,500 newtons), going so fast that boils water and only blast can kill a crab.
-Not usually in aquariums because it breaks the glass.
-Its shell is so tough that it is investigating for military development.