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What threats have caused many primate populations to decline?

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Illustration comparing the body plans of representative anthropoids, showing a male western lowland gorilla, a male human, a male bonobo, a female Bornean orangutan, and male and female northern white-cheeked gibbons, all labeled and depicted to scale. — primate Representative apes (superfamily Hominoidea).

Many primate populations are currently in decline, with approximately 75 percent of all species experiencing falling numbers and roughly 60 percent classified as threatened or endangered species.1

The primary threats driving these declines include:

Habitat Loss and Fragmentation: This is caused by logging, mining, urban sprawl, and the conversion of natural landscapes into areas for agriculture and livestock raising.12
Human Predation: This includes hunting and poaching, often for meat, as well as the illegal trade in primate body parts.132
Commercial Exploitation: The pet trade and the capture of primates for use in zoos and research laboratories have significantly impacted populations.12
Disease: Some primates are highly susceptible to infection from human diseases, which can devastate local groups.1

Protecting these species is a critical moral imperative, as their survival depends on the preservation of their habitats and the strict control of human-driven threats.3