Brown lemurs were first introduced to Berenty in 1975. These were a group of about 8 pet red-fronted lemurs (Eulemur rufus) originally brought from the west of Madagascar near Morondava. Later the de Heaulme family added 8 or 10 pets and orphaned red-collared brown lemurs (Eulemur collaris) from Fort Dauphin markets. They should not be able to hybridize, but they pay no attention to the authorities. As of 2005, there were over 250 browns in the reserve. These lemurs show linear hierarchy, adult female dominance, and the presence of conciliatory behavior after aggressions.