Lactating bats must provide milk until the young are able to fly on their own, i.e., until bone growth and mineralization are largely complete. Bats have small litters (one to two young), provide a large amount of milk to each young, wean them at a high proportion (ca. 55 90%) of adult mass, and appear to be sensitive to availability of calcium for milk synthesis. Many species of bats produce relatively concentrated milks, particularly species such as the Mexican free-tailed bat that forage over great distances between nursing bouts.
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