My Gay Dog and Other Animals

Same-sex behaviour has been reported in more than 1500 species and was observed by the ancient Greeks and Egyptians. But traditional evolutionary theory can't explain the purpose of being gay, or why it might be an advantage. So what are the animals up to? This frank documentary shows pets and animals on farms in zoos, and in the wild, caught on camera indulging in same-sex behaviour.

• Dominic HillDirector

• Fi GloverCast