Leontopithecus chrysopygus is now known to survive in 11 localities in the state of São Paulo. The population in the Morro do Diabo State Park contains 23,800 ha of forest and a population estimated at approximately 820 animals (Valladares-Padua and Cullen Jr. 1994). The Caetetus Reserve contains about 2,000 ha of forest (population estimated at about 40 individuals), but the other nine localities consist of fragments of between 400 and 800 ha, and together harbour about 114 individuals. The total population is estimated at about 1,000 animals spread through 11 isolated forests, 10 of which are certainly too small to be viable in the mid- to long-term.
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