Brazil's Snake Island is home to just two snake species, including one of the world's most venomous pit vipers

{}Ilha da Queimada Grande, known as Snake Island, hosts a unique evolutionary marvel. This isolated Brazilian island is home to the critically endangered golden lancehead viper. Rising sea levels trapped snake ancestors, leading to remarkable adaptations over millennia. The island's extreme snake population results from isolation and a specialized bird diet. Access is restricted to protect both the snakes and researchers studying them.