Vulture by Paul Jackson

 From Paul Jackson and Miri Golan, Origami Zoo

Frog by Mark Bolitho

 This is just the traditional Japanese frog, but with some extra folds to make toes. I should have started with a larger sheet of paper—toes were too delicate to fold at this size. From Mark Bolitho's Zoogami.

Dinosaur by Miri Golan

 Two very small slits needed for the arms. From Paul Jackson and Miri Golan, Origami Zoo.