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Further, like many pets, hermit crabs need enrichment and need opportunities for hiding and climbing. Huts, wood, and artificial plants can be used to fill this need. [45] In the wild hermit crabs may walk several miles a night for purposes of foraging or migration. [46] Hermit crabs are nocturnal and are most active during the night. [43]
P. armatus is one of the largest species of hermit crab: [3] adults may reach a carapace length of 43 mm (1.7 in). [6] The legs, including the claws, have bands of colour, in red, orange and white, and the claws bear short spines on the dorsal surface. [6] The eyestalks are short, but bear large black compound eyes. [6]
The decapod (crustaceans, such as a crab, lobster, shrimp or prawn) is made up of 20 body segments grouped into two main body parts: the cephalothorax and the pleon . [1] [2] Each segment may possess one pair of appendages, although in various groups these may be reduced or missing. They are, from head to tail:
Pagurus samuelis is a small hermit crab, at up to a total length of 40 mm (1.6 in) and a carapace width of up to 19 mm (0.75 in). [2] The base colour of the exoskeleton is brown or green, [2] but the antennae are red, and adults have bright blue bands near the tips of their legs. [3]
Hermit crabs cannot produce their own shells, and therefore must scavenge for abandoned ones. [ 5 ] [ 6 ] [ 7 ] Shell selection plays many crucial roles in P. longicarpus , such as providing protection from predators, desiccation and salinity stress, as well as influencing competition, population size, and reproductive behaviors in the species.
Pagurus hirsutiusculus is a species of hermit crab, commonly called the hairy hermit crab. It lives from the Bering Strait south to California and Japan , from the intertidal zone to a depth of 110 m (360 ft).
The coconut crab (Birgus latro) is a terrestrial species of giant hermit crab, and is also known as the robber crab or palm thief. It is the largest terrestrial arthropod known, with a weight of up to 4.1 kg (9 lb). The distance from the tip of one leg to the tip of another can be as wide as 1 m (3 ft 3 in).
Calcinus guamensis is a small hermit crab with a maximum shell width of about 6 mm (0.24 in). It is easily recognized by its coloration of a mustard brown or olive that fades into white, with its walking legs dipped in black. [5] Its uneven claws, with the left being significantly larger, are bluish-green and differ from its reddish-brown body.