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Coconut crab adaptations
Can coconut crabs smell blood?
Coconut crabs are an anomaly compared to other crustaceans. They can weigh up to nine pounds, measure three feet across, and climb trees, hunting for coconuts to methodically husk and eat. ... Within 20 minutes, five other coconut crabs swarmed to the spot, their keen olfactory senses drawing them to the smell of blood.31 . 2017 .
How does the coconut crab survive?
As adults they no longer use gastropod shells and instead rely on their tough exoskeleton to protect them from predators. Although they spend their multiple larval stages in water, when coconut crabs eventually become adults, they can't swim. In fact, they drown if they end up underwater for a prolonged period.
What did the coconut crab evolve from?
They can reach over 1 meter in leg span and weigh up to 4 kg. Evolutionarily, coconut crabs are hermit crabs, belonging to the infraorder Anomura (Crustacea: Decapoda). Coconut crabs' closest evolutionary relatives are terrestrial hermit crabs (Coenobita spp.).22 . 2018 .
Do coconut crabs live in the water?
Coconut crabs are considered one of the most terrestrial-adapted of the decapods, with most aspects of its life oriented to, and centered around such an existence; they will actually drown in sea water in less than a day. Coconut crabs live alone in burrows and rock crevices, depending on the local terrain.
Do coconut crabs breathe air?
As terrestrial crabs, coconut crabs have air-breathing organs that allow them to spend most of their lives out of waterhold them under water long enough and the crabs will actually drown.28 . 2016 .
Can coconut crabs eat humans?
As it turns out, coconut crabs are indeed edible for humans. On some islands in the Indian and Pacific Oceans, these crabs are served as a delicacy or sometimes even as an aphrodisiac. So many locals have enjoyed eating these crustaceans for centuries now.16 . 2018 .
How is the coconut crab adapted to its habitat?
Respiration. This organ can be interpreted as a developmental stage between gills and lungs, and is one of the most significant adaptations of the coconut crab to its habitat. The branchiostegal lung contains a tissue similar to that found in gills, but suited to the absorption of oxygen from air, rather than water.
What kind of force does a coconut crab have?
The largest coconut crabs can exert a force of 3,300 newtons (about 742 pound-force) with their pincers. Coconut crabs have also been known to open coconuts by dropping them from trees and striking them repeatedly with their pincers or using their pincers to pierce the coconuts husk before splitting the seed open.
What kind of organ does a coconut crab have?
Coconut crabs cannot swim and will drown in water. They use a special organ called a branchiostegal lung to breathe. This organ can be interpreted as a developmental stage between gills and lungs, and is one of the most significant adaptations of the coconut crab to its habitat.
How long does it take for a coconut crab to moult?
The hardened abdomen protects the coconut crab and reduces water loss on land, but has to be moulted at periodic intervals. Moulting takes about 30 days, during which the animal's body is soft and vulnerable, and it stays hidden for protection. Coconut crabs cannot swim and will drown in water.