Mammals play a role in environmental engineering. Outside of protected
areas, Ethiopia’s mammalian supply is rapidly dwindling, and there is a
scarcity of data on mammalian diversity and ecology. As a result, from
June 2020 to February 2021, a study was conducted in Arjo Diga Forest to
determine the species composition, distribution, relative abundance, and
threats of large and medium wild mammals. Using transect lines, survey
techniques were used to record mammals from four habitat types, Eighty
people participated in a questionnaire survey to identify the current
threatening factors. A total of 763 individuals were compiled belonging
to 19 mammalian species, 6 orders, and 12 families. Papio Anubis (30.3
%) was the most abundant in the research region, followed by
Chlorocebus mitts (22%), while Panthera pardus and Panthera Leo were
the least, contributing 0.79 % and 0.39 % of the total observation,
respectively. There is, however, a significantly varied among habitats
(χ2 = 246.4; DF = 18; P < 0.05). Among observed mammals, (n =
433, 56.75%) individuals were recorded in dry season, while (n = 330,
43.25%) individuals were recorded in wet season and abundance of
mammals species not significantly between seasons (χ2 = 12.12; DF = 18;
P >0.05). The diversity of species varies depending on the
stratified habitat types. The Shannon–Wiener Index values, on the other
hand, do not differ much between habitat types. The research area’s
species diversity was H′ = 2.296, with the highest Simpson Index of
diversity (1-D) being (0.8406). Agricultural land expansion, illegal
logging, overgrazing, quarry operations, and illegal hunting are all
threats to the species that inhabit the study area. A quick national
park is required to rescue these species