The yellow crazy ant Anoplolepis gracilipes is a notorious invasive animal species causing serious problems in the areas where it has been introduced so far. Accordingly various attempts have been made to collect biological information to manage the said ant species. Recently, we had the opportunity to study the behavioural events in respect to emergence from the nest, entering the nest as well as guarding the nest –hole in A. gracilipes occurring in the Achhruram Memorial College campus, Purulia, West Bengal, India. It is revealed that these ants are habituated to go out of the nest on average 13.92 ± 1.12 SE, entering the nest 10.9 ± 0.75 SE and guarding the nest –hole 12.73 ± 1.16 SE (N=85) per minute during day hours. While such numbers differed significantly (p <0.05) with respect to behavioural events considered for studies, no significant difference could be established in respect to seasons (p <0.06). Thus the present findings suggest that, being invasive species A. gracilipes have developed various devices to protect them from the attack of endemic species on way of exploiting the endemic species.