Joel Sartore Joel Sartore

National Geographic Photographer and Speaker

An endangered (IUCN) and federally threatened Yucatan black howler (Alouatta pigra), at the Gladys Porter Zoo. This is the only Yucatan black howler in captivity.

ESA002-00313

An endangered (IUCN) and federally threatened Yucatan black howler (Alouatta pigra), at the Gladys Porter Zoo. This is the only Yucatan black howler in captivity.

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