Ilha da Queimada Grande, or Snake Island, is a dangerous place. Thousands of golden lancehead snakes live there. Their venom ...

Ilha da Queimada Grande, or Snake Island, near Sao Paulo, Brazil, is very dangerous. Thousands of venomous golden lancehead ...

Snake Island is infested with an estimated 2,000 to 4,000 golden lancehead vipers, ... who stops by once a year to maintain the island's lighthouse, and groups of biologists who study the snakes.

Now the only visitors to Snake Island are a once-a-year visit by the Brazilian Navy to check on the lighthouse, and a very few select scientists that have a permit to study the snakes. They are ...