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Orange coloring is manifestation of a recessive gene. This specimen is very old, and has been exiled from the tribe, so he is foraging on the ground. Next observation shows the impact of this former alpha.

Date is approximate. 3 individuals (2 males & 1 female) seen sometime in April, 1987. My mother and father (@dmpeterson ) were living in Monteverde in the spring of 1987, staying with the Gavin family. I have been digitizing their old slides, and thought these ones were significant, so I uploaded them. The date and location are approximate, based on their best recollection.

Individual of howler monkey with anomalous yellow pigmentation in one hand. This individual is part of a troop inhabiting a periurban region close to Cabuya beach, northern Costa Rica.

Address: Cabuya, Puntarenas

Coordinates: N 9°36'12.1176", W 85°5'23.0532"

Date of the record: (YY/MM/DD):2020/08/07

Image credits: Wilfrido Villalobos