Recorded only from the interior region of the Brazilian state of São Paulo (4). The black lion tamarin was believed to be extinct from 1905, until it was rediscovered in 1970 in a reserve in south-western São Paulo. At that time it was estimated that the population numbered fewer than 100 individuals (4). At present, about six populations are known, and the number of remaining individuals is estimated to be less than 1000 (6).
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