Australian calico crab.

Coenobita Variabilis, sometimes known as the Australian crazy crab, the Aussie crab, or Calico crab, is a species of hermit crab not found within the U.S. as many hermit crab species are. They tend to have a reddish-brown, light brown (Rarely a yellow-ish colour.) or-you guessed it- a calico colour. They are mainly exported from Australia, and earned the name 'crazy crab' due to the fact that it was the name of the first company to capture and export them.