black-headed bushmaster, lachesis melanocephala is the largest poisonous snake in costa rica and endemic to the country

blackheaded bushmaster lachesis melanocephala largest poisonous snake costa rica endemic country zone corcovado south serpent pitviper herp closeup view green unique venomous reptilian field guide wild mouth rain forest predator terrestrial fauna white peruvian herpetofauna herpetology rainforest natural danger deadly head venom forked tongue black headed close macro outdoor nature dangerous reptile animal viper wildlife found only southern part