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The uripygial (preen) gland fat of the common sparrow (passer domesticus) is a mixture of ester waxes of which 3-methyl-substituted fatty acids with a chain length of C 11 -C 17 were shown to be the acidic components; they were characterized by IR-, NMR- and mass spectrometry. The alcoholic components are n-alkanols with a chain length of C 12 -C 19 . Separately investigated female and male sparrows showed identically composed waxes. The simultaneously investigated depot fat is a mixture of triglycerides with usual composition.
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Jacob et al. (1970) studied this question.
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