Abstract: The Western Lowland Gorilla, G. gorilla gorilla (Primate: Hominidae) is one of the largest living primates, maintained at Sri Chamarajendra Zoological Gardens, Mysuru (Latitude: 12.3028° N, Longitude: 76.6552° E). It is an exotic species, kept in a well maintained enclosure for public display for creating awareness among the public and for education, conservation and scientific studies. During the present study, after obtaining the permission from the higher authority, Sri Chamarajendra Zoological Gardens, Mysuru, proper planning was made by consulting with Zoological Garden Authority, Range Forest Officer, Animal Caretaker, Education Officer and Biological Scientist to conduct observation so as to record the behaviour of Gorilla. Observations were made two days in a week from morning (10.00 AM), afternoon (01.00PM) and evening (04.00 PM) hours for a period of 56 days i.e., from 4th April to 31st May, 2025. Observations were made using the focal animal sampling method with each session lasting for a period of 20 minutes by distance outside the enclosure, without creating any disturbance for its activity. Total 17 behaviours were recorded namely: locomotion, drinking, eating, sleeping, resting, vigilance, vocalisation, positive and negative interaction, approach, depart, jumping, hanging, grooming, jumping, chest beating, chasing and sun bathing etc., by following standard methods. All these observations were non-invasive and no interaction or interference with the normal activity of Gorilla in its enclosure. The study was conducted under the awareness of Zoological Gardens Authorities and aligned with the ethical standards for observational studies in Zoological Gardens. Collected data was systematically compiled and analysed using standard methods. Sixteen different behaviors were recorded during morning hours, however, during afternoon and evening hours, all the 17 behaviors shown by G. g. gorilla. Analysis of variance of different behaviors of G. g. gorilla did indicate significant variation (F=6.797; P

Downloads: | DOI: 10.17148/IARJSET.2026.13207