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The park has 11 living species of lemurs with the most unique being the [[Silky sifaka]], the second largest lemur after the [[Indri|Indri indri]]. The Silky sifaka, locally known as the Simpona, is a highly endangered species that can be found only in Marojejy and [[Anjanaharibe-Sud Special Reserve]]. Most lemur species in Marojejy are nocturnal, while some are diurnal and others are cathemeral. The Silky sifaka is one of the day-active lemurs.