The eruption and wear of the cheek teeth of male Fallow deer from a park and wild population has been studied for age determination purposes. It was found possible to age accurately up to 48 months animals whose date of death was known, whether they were from a wild or park population. It was found that up to at least this age individual and environmental differences affecting animals born in successive years did not mask those resulting fromthe restricted seasonal breeding of this species.Antler development and body weight were studied in relation to the ages obtained and were found to be of limited value for age estimation.