The goal of this program is to reduce threats to apes in their natural habitats. It focuses specifically on the protection of ape populations and habitats in priority landscapes. Prioritization is based on the size of the habitat, size and density of the ape population, the number and species and level of threat, the presence of effective conservation efforts, and the existence of supportive institutions and legislative frameworks.
Arcus investments follow three guiding principles: Support goes to initiatives that are long-term, holistic, and collaborative. The 2010-2015 conservation strategy has identified 16 priority landscapes: 10 in pristine areas , 5 in frontier areas , and 1 isolated area .
While support is available for short-term projects to mitigate sudden threats or meet urgent ape protection needs, the majority of Arcus conservation investments are designed to support: Organizations which take a holistic approach, and which focus on long-term engagement and collaboration; collaborative efforts with influential policy-level partners—including governments, multinational, and private sector organizations—to analyze socio-economic factors and link livelihoods and development initiatives with conservation goals; capacity building and investment in organizations and leaders to meet locally appropriate needs and priorities and to monitor and assess the impact of their work.
To learn more about apes in their natural habitat, the threats they face, and how you can protect them, visit the A.P.E.S. Portal.
 Leuser ecosystem (including Tripa swamp) in Aceh, Indonesia; Central Kalimantan, Indonesia (Sebangau & Tanjung Putting, Mawas and Katingan Sampit); Democratic Republic of the Congo (three in central DRC: Salonga-Lukenie-Sankuru, Lomako Yokokola and Tshuapa-Lomami-Lualaba; and one in eastern DRC:Maiko Tayna Kahuzi Biega); Virunga ecosystem, spanning the border of DRC, Uganda and Rwanda; Tai-Sapo forest corridor along the Liberia / Cote D’Ivoire Border; The Greater Mahale Ecosystem in Tanzania; Thai Forest complex along the Thai side of the country’s border with Myanmar.
 Danau Sentarum and Betung Kerihun national parks in West Kalimantan, Indonesia; Gunung Palung and Belantikan forest areas in West Kalimantan, Indonesia; Kinabatangan, Upper Segama, Tabin and Kulamba sites in Eastern Sabah, Malaysia; two sites covering areas in northwest Lao PDR and southern China( Wiliag ad Aliao mountains); Takamanda National Park and Mone River Forest Reserve in southwest Cameroon and the Afi and Mbe mountain areas of southern Nigeria.
 Covering Guangxi province, China, and Cao Bang province, Vietnam.