Mercury Poisoning Makes Birds Act Homosexual Metal may influence sexual development in white ibises, expert says.

Male birds that eat mercury-contaminated food show "surprising" homosexual behavior, scientists have found.
In a recent experiment in captive white ibises, many of the males exposed to the metal chose other males as mates.
These "male-male pairs did everything that a heterosexual pair would do," said study leader Peter Frederick, a wildlife ecologist at the University of Florida in Gainesville.......http://news.nationalgeographic.com/news/2010/12/101203-homosexual-birds-mercury-science/