Aukland Island Merganser. Of all the animals that have become extinct, birds make up the greatest number, and one of these is the Aukland Island Merganser. There are only four species of mergansers left on the earth, and all are endangered. They are most closely related to ducks, geese, and swans.What are some animals living in the rainforest?
Rainforest Animals. Rainforests are tremendously rich in animal life. Rainforests are populated with insects (like butterflies and beetles), arachnids (like spiders and ticks), worms, reptiles (like snakes and lizards), amphibians (like frogs and toads), birds (like parrots and toucans) and mammals (like sloths and jaguars).