Osteoporotic lesions were evaluated in the skulls of moose (Alces alce
s) collected in Isle Royale National Park, Michigan (USA), from 1958 t
o 1994. Circular lesions which penetrated the outer table of the skull
were distributed over the frontal and nasal bones asymmetrically in b
oth sexes. About 32% of skulls recovered had some porotic lesions with
slightly greater prevalence among males.