Joel Sartore Joel Sartore

National Geographic Photographer and Speaker

Picture of endangered (IUCN) and federally endangered Francois' langurs (Trachypithecus francoisi) at Omaha Henry Doorly Zoo.

ANI040-00306

Endangered (IUCN) and federally endangered Francois’ langurs (Trachypithecus francoisi) at Omaha Henry Doorly Zoo. This species exhibits ‘aunting’ behavior, meaning several females will take care of the same baby. The bright orange coloration (which disappears by age six months) is thought to allow for easy tracking of the young one no matter which surrogate mom has it at any time.

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