(Daniel Riskin) The sucker-footed bat, as it is known, likely sticks to surfaces with a sweat-like substance and would easily become unlatched if hanging upside down.
Sticky Science: Why Some Bats Sleep Head-Up
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DECEMBER 15, 2009
Jeanna Bryner, Live Science

A tiny bat that hangs out in Madagascar is an odd sleeper: Unlike other bats that hang upside-down, this one roosts head-up, and now scientists know why.
Read the story by Jeanna Bryner: www.msnbc.msn.com/id/34422031/