Behaviour and Diet of Colobus angolensis palliatus Peters, 1868, in Relation to Seasonality in a Tanzanian Dry Coastal Forest

Observational data from a 1-month study (November 1991) on a troop of Tanzanian black colobus, Colobus angolensis palliatus Peters, 1868, are presented. The troop inhabits an area of dry semi-evergreen forest in the eastern portion of the Gendagenda South Forest Reserve, Tanzania, which is subject to a bimodal seasonal climate. We show that during a period at the end of the dry season, the troop spent significantly more time feeding at the expense of resting, had a higher dietary diversity and ranged over a much greater area than during a period at the beginning of the wet season.