Abstract
An investigation into the influence of age on the prevalence of parasitic infections among wild mammals in captivity in Thrissur Zoo w as carried out by regular faecal examinations over a period of one year. The prevalence of helminthic infection in herbivores and omnivores was higher in the animals aged one year and above, the rate being 71.62% and 65.9% , respectively, when compared to their younger counter parts of age one month to one year, the rates being only 51.8% and 64.7% respectively. The animals of age below one month of both groups were found to be negative for helminthic infections.