Phalangeal formula is a way of
comparing animals by the number of phalanges that they have in each of
their digits. It can be used to study phylogeny or to predict how
an animal may use its hands and feet. An animal's phalangeal
formula is simply given as a series of numbers. Plantigrades, digitigrades, and unguligrades are all
associated with different numbers of digits as well as different
phalangeal formulas. 

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