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Aproteles
We caught this fruit bat (humanely) in a fine mesh net on a night walk in our school rainforest. Adorably cute and unbearably loud, we all enjoyed measuring it like biologists and taking shot after shot of it. Finally we released back to its home but not without many fond ranging to horrible memories of its shrieks.
Aproteles bulmerae is endemic to New Guinea. The story of its rediscovery is worth reading:
http://en.wikipedia.org/wiki/Bulmer%27s_...
http://www.edgeofexistence.org/mammals/s...
If you look in the second to last picture you can actually see his mouth open mid-shriek.
More like high pitched shrieks, but yes, bats can scream, and this one's were especially loud as he was very scared at being taken out of the nice dark forest and into bombarding lights! (He's a juvenile male bat)