Grunt, grunt, go! The alpha male gets the other drills moving two deep grunts. He will generally stay well ahead of the troop, which numbers up to 20 or so and includes related females and offspring. Is it the alpha male who bears responsibility for keeping the troop safe and for leading them to food. Spending their days in thick jungle, they forage on the ground and in trees for tidbits such as fruits, nuts, eggs and small animals. But the shrinking size of the drill's rainforest home hangs over their heads with one of the most restricted ranges of any large African monkey, deforestation and hunting are driving populations to the edge.
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Head and body length: females 45 - 50 cm, males: 61 - 90 cm, tail: females 5 - 9.4 cm, males 8.6 - 1
females: 7.2 - 20.5 kg, males: 19.5 - 45 kg
Estimated at fewer than 10,000