About of all mammal species are bats. The world’s lightest mammal is the bumblebee bat. Bats can consume insects in one night. The world's largest bat, the Rodrigues fruit bat, has a wingspan of up to 6 ft.
Manta Ray leaping 9 feet in the air off the coast of Costa Rica, Central America // photo by Roland Seitre Solent. 2010 -- click photo for article; "Natural Selection" is a great book about rays developing the ability to fly.