Mantis shrimp

The Mantis Shrimp (シャコ, Shako) is a type of deep sea creature first found in.

In New Leaf
Once the player donates a Mantis Shrimp to the museum, it can be found in the large pool in the first room of the ocean exhibit, along with many other species of deep sea creatures. It is found in the corner near the big rock close to the entrance of the large saltwater exhibit.

"Mantis shrimps have long, sickle-shaped legs and thick carapaces covering both their bodies and tails. They strike captured prey with claws powerful enough to crack the shells of even the toughest crabs. They are a popular dish with fans of seafood, though females with eggs are worth more than males."