Daily Activity time Budget and Diet Composition of Grivet Monkey (Chlorocebus Aethiops) at Dugda Ukulo Kebele,Tiyo Woreda, East Arsi Zone

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Addis Ababa University


Grivet monkeys (Chlorocebus aethiops) are a primate species distributed along East of the White Nile in Sudan to Ethiopia, Eritrea, and Djibouti. This study documented data on the activity time budget and diet composition of a troop of grivet monkeys in the situated in the Dugda Ukulo Kebele, Tiyo Woreda of east Arsi Zone. The study was conducted between October 2018 and March 2019 using direct observation method. A total of 576 scanning sessions each with a duration of 10 minutes were employed during the study. The troop selected for the study was the resident group occurring close to tributaries of Bosha River near to Bosha irrigation horticulture farm. The results showed that, the study troop was generally more active during the morning and late afternoon than around midday where the monkeys mostly rested and socialized. The percentage proportion of time was allocated for feeding (20.91%) and moving (22.52%), while the time allocated for resting (6.59%) and playing were the lowest (8.15 %). Adult females socialized slightly more than males (9.69% vs 6.8%) Males rested more than females (0.43% vs 0.27%). Aggression behaviors were observed within the groups and outside of the group as intra and inter group aggression. Aggressions were caused by the presence of predators and dominancy level. Mating was the least observed behavior in the study. The grivets were observed to feed on thirty one plant species in the study area with guava (7.36%), water berry (6.44%), kummel (6.21%), Sycamore fig (5.91%) and Conker berry (5.75%) forming the highest proportion of the diet. Eucalyptus tree (0.78%) and fig tree (0.98%) were rarely consumed.



Behavior, Activity Pattern, Activity Time Budget, Grivet Monkeys, Chlorocebus Aethiops, Demographic Groups