Abstract
Ages of raccoons (Procyon lotor) less than 110 days old may be estimated by eruption of some deciduous and permanent teeth. Deciduous first, second, and third incisors erupt at 1 month; deciduous second, third, and fourth premolars at 1.5 months; deciduous first premolars and permanent first incisors at 2 months; permanent second incisors and first molars at 2.5 months; permanent third incisors at 3 months; and permanent canines at 3.5 months. This paper reports the sequence and timing of tooth eruption, prior to weaning, in captive raccoons of known ages. Hamilton (1936:136) stated that deciduous canines and lower incisors erupted by 19 days of age and deciduous upper incisors by 20 days of age in captive raccoons; Stuewer (1943:213) reported that all permanent teeth erupted while wild young were being weaned at 16-20 weeks of age. Captive raccoons were weaned by their mothers at about 13-17 weeks of age (G. G. Montgomery, unpublished data, Illinois Natural History Survey, Urbana). Acknowledgment is made to Glen C. Sanderson and William R. Edwards for reading the manuscript. Sernylan was supplied through the courtesy of G. M. Kurzon, M.D., Department of Clinical Investigation, and by F. E. Eads, D.V.M., Department of Veterinary Medicine, Parke-Davis and Co., Ann Arbor, Michigan.
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