This species is adapted for diving and swimming in water thanks to its modified rear limbs. The bones of the feet are longer than usual and can extend like a fan under water, in a similar way as its hind limbs have modified fingers that give the shape of the wings. These extended membranes are usually folded during regular flight, but can be extended as well during soaring to aid in saving energy.
The patagium, or wing membrane, contains special elastic fibers that get harder in water to help the bat swim more efficiently.
Hunting strategy:
The bat soars close to the surface of the water with the help of the wind currents like gannets. Once it sees its prey, it flies up in the air and the plunges head first into the water. With its prey in its mouth, it quickly swims towards the surface at high speed, and like a flying fish it hops in and out of the water several times until it gains enough momentum to start flapping its wings and fly.
http://blogs.bu.edu/biolocomotion/2011/10/16/bats-the-only-flying-mammal/ <- important!
https://www.nationalgeographic.com/animals/fish/group/flying-fish/
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