--- title: "Coconut Crab (Birgus latro) | AnimalTracks.wiki" description: "Land arthropod of up to 4 kilograms, with coconut-cracking claws and a leg span of up to a meter." image: "https://animaltracks.wiki/images/animals/coconut-crab-1.webp" published: "2026-08-31" updated: "2026-09-13" --- # Coconut Crab (*Birgus latro*) > **Status**: Checked against 7 sources, listed under Sources below. > **Tagline**: Land arthropod of up to 4 kilograms, with coconut-cracking claws and a leg span of up to a meter. > **Soundtrack Vibe**: Afrobeat // Fela Kuti, "Zombie" > **Soundtrack Links**: [Spotify](https://open.spotify.com/track/2r0KlAVemiB1TyTqgCh5ve) | [YouTube](https://www.youtube.com/watch?v=-3j0nugz1Pw) > **Vibe Match**: Blistering polyrhythmic horn sections and relentless groove stamina, for a crab whose strongest measured pinch hit 1,765 newtons and whose tracked males roamed several kilometers between coast and forest. ## Biological Superpowers & Stats - **Taxonomy**: *Birgus latro* - **Danger Level**: Medium - **Conservation Status**: Vulnerable ([IUCN Red List](https://doi.org/10.2305/iucn.uk.2020-2.rlts.t2811a126813586.en)) - **Superpower**: An estimated 3,300-newton claw pinch for a 4-kilogram crab, calculated from measurements on wild animals, enough to beat the bite force of most living land predators, alligators excepted. - **Habitat**: Coastal habitats and burrows on tropical Indian and Pacific Ocean islands, up to 6 km from the shore - **Diet**: Coconut flesh and other tropical fruit, nuts, seeds, and carrion, including other crabs - **Tags**: crustacean, apex-predator, super-bite-force, island-life, nocturnal, scavenger, climber ## Natural History & Behavior ## The Biggest Arthropod on Land The coconut crab (*Birgus latro*) is a hermit crab that outgrows the borrowed shells of its youth. Animal Diversity Web records a maximum carapace length of 200 millimeters, a leg span of up to a meter from tip to tip, and a top weight of 4 kilograms, and a GPS-tracking study on Christmas Island calls it "the world's largest land-living arthropod." Growing that big takes decades: a review of the species says it "reach[es] their maximum size only after 40-60 years," and the tracking study notes it "can reach an age of up to 60 years." ## The Mighty Claw A crab has several ways into a coconut: it may haul one up a tree and drop it, or poke a claw through one of the coconut's soft "eyes" to split it open. That claw is a serious tool. Researchers had 29 wild crabs, weighing up to 2.1 kilograms, pinch a steel sensor, and the strongest pinch measured 1,765 newtons. Using their equation linking weight to pinch strength, the team estimated what a crab at the species' reported 4-kilogram maximum could manage: 3,300 newtons. > **How it compares** That estimated 3,300-newton pinch would far exceed the pinch of every other crustacean species reported, and beat the bite force of most living land predators, alligators excepted. ## Lungs on Land, Larvae at Sea A coconut crab's gill area, for its body weight, is the smallest measured in any land crab, and its gills do little to take up oxygen; it breathes through branchiostegal lungs instead. One study on the species puts the risk plainly: apart from its marine larval stage, the crab "is fully terrestrial, and will actually drown if submerged in water." Breeding still needs the sea: a female releases up to 138,000 eggs into shallow water in one spawn, and the hatchlings drift through several larval stages at sea before migrating onto land. ## A Loner With a Nose Like an Insect's Spread across small tropical islands in the Indian and Pacific Oceans, coconut crabs live in burrows and are mostly solitary. Adults scavenge fruit, nuts, seeds and carrion, other crabs included. On Christmas Island, GPS-tagged males made short trips from a home site, mostly at night, and some roamed several kilometers between the coast and inland forest; crabs moved away from home could find their way back over large distances. Their sense of smell is unusual too. One study found the crab's nose has evolved to resemble an insect's, with similarities in physiology, behavior, and anatomy: convergent evolution, where similar pressures produce similar solutions. ## Frequently Asked Questions ### How strong is the pinching force of a coconut crab's claws? Scientists measured the claw pinch of 29 wild coconut crabs weighing up to 2.1 kilograms; the strongest measured pinch hit 1,765 newtons. Plugging the species' reported maximum weight of 4 kilograms into the team's equation linking weight to pinch strength gives an estimated 3,300 newtons, which would beat the bite force of most living land predators, alligators excepted. *(Source: [Oka, Tomita & Miyamoto 2016]())* ### Can a coconut crab survive underwater? Not as an adult. Its gills play little part in taking up oxygen; that happens in its branchiostegal lungs. One study puts it plainly: apart from its marine larval stage, the crab "is fully terrestrial, and will actually drown if submerged in water." *(Source: [Stensmyr et al. 2005]())* ### How large can a coconut crab grow, and how long does it live? Large adults can have a carapace up to 200 millimeters long, a leg span up to a meter tip to tip, and a weight up to 4 kilograms, making them the largest terrestrial arthropods known. They are also slow growers: a coconut crab does not reach its maximum size until it is 40 to 60 years old, and can live up to 60 years. *(Source: [Animal Diversity Web, University of Michigan]())* ## Sources 1. [Birgus latro (coconut crab). Animal Diversity Web, University of Michigan.]() 2. [Oka, Tomita & Miyamoto (2016). A Mighty Claw: Pinching Force of the Coconut Crab, the Largest Terrestrial Crustacean. PLOS ONE.]() 3. [Kumaralingam (2020). The Robber Crab Birgus latro (Linnaeus, 1767). Crustacea.]() 4. [Stensmyr et al. (2005). Insect-Like Olfactory Adaptations in the Terrestrial Giant Robber Crab. Current Biology.]() 5. [Krieger et al. (2012). Giant Robber Crabs Monitored from Space: GPS-Based Telemetric Studies on Christmas Island (Indian Ocean). PLoS ONE.]() 6. [Greenaway (2003). Terrestrial adaptations in the Anomura (Crustacea: Decapoda). Memoirs of Museum Victoria.]() 7. [Cumberlidge (2020). Birgus latro. The IUCN Red List of Threatened Species 2020: e.T2811A126813586.]() *Published August 31, 2026. 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