sentence: Most bats rest, sleep and hibernate in an upside-down position.
sentences_after: They hang on to branches or rocks with their feet. To do this they have a locking mechanism on the tendons in their feet which stops them from slipping. Simmons N.B. and Quinn T.H. 1994. Journal of Mammalian Evolution'. The advantage of this is that the energy they spend hanging on is greatly reduced.
concept_name: bat
headings: Bat Adaptations Resting position