They are very sharp in order to bite through the hardened armor of insects or the skin of fruit.
Thermographic image of a bat using trapped air as insulation.
While other mammals have one-way valves only in their veins to prevent the blood from flowing backwards, bats also have the same mechanism in their arteries.
The finger bones of bats are much more flexible than those of other mammals. One reason is that the cartilage in their fingers lacks calcium and other minerals
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