Onya-Birri the koala
This rare albino koala was born in 1997 in the San Diego Zoo. His name, Onya-Birri, means "ghost boy" in the Aborigine language. He spent the first part of his life in his mother's pouch, finally making his surprise appearance six months after being born.
Although albino koalas have been known to exist in the wild, Onya-Birri is the only one known to science.