Lachesis sp., commonly known as bushmasters, are large, venomous pit vipers found in Central and South American rainforests. They are nocturnal, ambush predators, with a distinctive triangular head and heat-sensing pits. Their size and potent venom make them formidable, yet they are reclusive and rarely seen.

The genus Lachesis, commonly known as bushmasters, is native to the neotropical regions of Central and South America. They are found in countries including Costa Rica, Panama, Colombia, Ecuador, Peru, Bolivia, Venezuela, and Brazil.

Bushmasters inhabit humid tropical rainforests and lowland deciduous forests. They prefer areas with dense vegetation that provide cover and ample humidity.

Lachesis species are terrestrial and primarily nocturnal, occupying a niche as apex predators within their environment. They prey on small mammals, birds, and occasionally other reptiles. Their preference for forest floors and fallen logs provides them with camouflage and protection.