Mark Bowler / Red Howler Monkey (Alouatta seniculus) hanging by tail with non-prehensile tailed Peruvian red uakari monkey (Cacajao calvus ucayalii). Captive at Pilpintuwasi Animal Orphanage, Padre Cocha, Iquitos,...
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Joel Sartore / Photo Ark / Ucayali bald-headed uakari (Cacajao calvus ucayalii) head portrait, Los Angeles Zoo. Captive, occurs in western Amazon.
