Wander into the wrong bit of forest in Gabon’s Lopé National Park and you could find yourself surrounded by a troop of over 800 primates. Here, mandrills are known to roam the forest in enormous groups called “hordes,” and suffice to say, it’s not a party you want to crash with your puny human teeth. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Native to the rainforests of central Africa, mandrills ( Mandrillus sphinx ) are the largest monkeys in the world . They may be mistaken for apes due to their apparent lack of tail (the easiest way to tell a monkey from an ape is to see if it has a tail), but mandrills are Old World monkeys and do actually have stubby little tails. They also exhibit pretty extreme sexual dimorphism, meani

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