Animal Mimicry (category) – The person can turns into any animal in a category of animals and gains the powers of that animal.
Aviax (DC) can turn into any type of winged animal.
Insect Queen (DC) can take on any insect form including Kryptonian insects.
Reptil (Marvel) can turn into any type of dinosaur (Avengers Academy #1).
Snowbird (Marvel) can turn into any creature of the Canadian Artic.