The giant Fijian long-horned beetle (Xixuthrus heros)[2] is native to the island of Viti Levu in Fiji, and is one of the largest living insect species, with specimens around 15 cm long, excluding legs, antennae, or jaws.

These beetles have powerful jaws, and should be handled with care when alive—when threatened, they produce a loud and fearsome hissing noise by squeezing air out from under their elytra.

[3] Xixuthrus heros is distributed in the lowland rainforests of south-east Viti Levu, with Colo-i-Suva Forest Reserve being the stronghold; natives in some nearby villages continue to consume the larvae when they split decaying wood, which is then burnt for fuel, placing additional pressures on the population.

Both male and female X. heros are primarily nocturnal and demonstrate embark on long-distance flights in their quest for mates and suitable host trees.

Large trees, vital for the species' survival, are at risk due to extensive logging and the conversion of native forests into agricultural lands.