Uric Acid Dihydrate in Bird Urine

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Science  28 May 1971:
Vol. 172, Issue 3986, pp. 958-959
DOI: 10.1126/science.172.3986.958


X-ray diffraction analysis shows that the white excrement from a budgerigar, consists mainly of uric acid dihydrate. Initially this material is in the form of a smectic (or cholesteric) phase, which transforms to the normal crystalline phase either on aging or on removal of the minor (soluble) constituents of the excrement with water or dilute acids.