The uropygial (preen) gland fat of the rook (Corvus frugilegus) is a mixture of ester waxes of which 2-methyl-substituted fatty acids with a chain length of C 16 -C 22 are shown to be the acidic components. The alcoholic components are n-alkanols with a chain length of C 6 -C 12 . As to the 32nd order of the natural system the uropygial gland fat seems to differ in the single families already if compared with that of the common sparrow
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Jacob et al. (1970) studied this question.