The green plant cover of highly populous Bangladesh is degrading rapidly. Lack of knowledge on flowering and fruiting seasons of plants is partly responsible for this situation. Fruit-eating birds, the agents for seed dispersal and germination, are also important. In this study, the fruiting season, fruit color spectra, avian frugivore diversity, avian frugivores relationship with fruit size, foraging and fruit handling techniques were documented. Both the fruiting season and Fruit-eating birds in a mixed evergreen forest of Bangladesh were focused to understand the contribution of these biological agents in a ecosystem.