Because there are so many snakes on one island, by some estimates one snake to every square meter (10.8 square feet) of the island, there is competition for resources. Despite a population of 41 recorded bird species on Queimada Grande, the "golden lancehead" relies on only two: the "Troglodytes musculus" (the southern house wren), which is usually able to avoid the golden lancehead as a predator, and the "Chilean elaenia" (a species of flycatcher), which feeds on vegetation in the same area as the snake.