He’s huge, antisocial, will steal your cutlery and may tear whole coconuts together with his claws.
This whale is a land-dwelling arthropod (invertebrate with articulated legs). coconut crab (Birgus the thief), also called the robber crab (since it is believed to steal shiny objects, e.g. magpie), lives only on tropical islands within the Indian and Pacific Oceans. There are larger crabs within the sea whose weight is “supported” by the water!
Adult crabs reach a leg span of 1 m, a body length of 40 cm and a weight of as much as 17 kg (although they sometimes reach 4 kg. The largest insects (Goliath beetles) weigh only 100 grams… These crabs can live as much as 60 years (!), so an extended time for a crustacean, but they grow throughout their lives.
Despite its name, the coconut crab just isn’t a typical crab, but a hermit crab that has returned to land. But while hermit crabs protect their soft abdomen in snail shells, this huge species hardens it like lobsters. Typical crabs have a significantly reduced abdomen.
He eats the coconut… in fact.
This could appear obvious based on the name coconut crab. But in the event you’ve ever tried to crack a coconut, you understand it is a difficult challenge. In fact, there was once an extended scientific debate about whether coconut crabs could really open the fruit. It seems that they’re as much as the challenge, but not only do they open the prize and delve into its contents.
This weight loss program helps coconut crabs grow: those with access to coconuts might be twice as massive as those without them. But eating fruit just isn’t essential for his or her survival. What other objects do the biggest land arthropods stuff into their mouths?
A coconut crab’s weight loss program may include other tropical fruits, fallen plant material, dead and decaying animals, rats, and other crab species. They even eat members of their very own species. Biologist Mark Laidre says they relatively recently evolved to eat coconuts – a skill unique to modern coconut crabs – that helps them eat one another.
They also eat their very own discarded body parts. As coconut crabs grow, they periodically melt their tough outer layer (exoskeleton) and form a brand new one. After they finish molting, which takes a few month, they devour their very own exoskeleton
They are nocturnal, spending the day hidden in tree hollows, burrows dug within the sand or loose soil within the jungle or rock crevices, but only as much as 6 km from the ocean. At night they arrive out and feed on… you guessed it, coconuts. Their huge and powerful pincers allow them to crack open the hard shell of coconuts, but in addition they eat quite a lot of softer green plants, especially figs and bananas, in addition to turtle carrion or eggs (including hatchlings) and even rats! In fact, the tongs can lift objects weighing as much as 29 kg!
Despite this, they don’t climb coconut trees only for the fruit, but eat the contents of the palm trunk. These huge crustaceans have a developed sense of smell because they’ll smell rotting meat or fruit from an extended distance. Their eyesight is poor and, like snakes, they detect vibrations in the bottom.
Coconut crabs are known to climb trees as much as 6 m high. Their presence is evidenced by pieces of coconut husks left at the doorway to their cavities, in rotten tree trunks which have fallen to the bottom, as they bring about food to their lairs to eat safely eat. They are adapted to life on land, they may drown within the sea, respiration with lungs! In June and July, the crabs molt and remain hidden of their burrows for as much as 30 days.
Video: Coconut crab in Indonesia
Despite this, the animal’s marine origins are obvious during breeding, as females lay their eggs within the sea and the larvae live within the ocean for 28 days. The young use the shells as they’d any hermit crabs or coconut shells if not available. They reach sexual maturity on the age of 4-8, which is amazingly late for arthropods.
The meat of this huge crab is amazingly valued, identical to lobster or other crabs, and can be considered an aphrodisiac. Still, meat may contain toxins from plant consumption.
Coconut crabs are little-studied creatures and we’d like to learn more about them – not only because they’re amazing and have rather a lot to inform us about biology, but additionally because we wish to maintain them with us.
They could also be huge and heavily armored, but they might be defenseless. Coconut crabs grow extremely long – they’ll live for over 40 years – and introduced predators equivalent to rats can harm smaller, younger crabs or those which are within the means of shedding their exoskeletons (when their bodies are soft). Habitat loss has also caused local declines in some areas.
The International Union for Conservation of Nature considers the coconut crab a data-deficient species: that’s, we do not know enough about its locations and populations. That’s why we’d like to review and learn more about these amazing, otherworldly creatures.
Source and reference: mentalfloss.com | news.softpedia.com/ |
