Howler Monkeys: Sarapique River at Puerto Viejo, Costa Rica — the Howler Monkey is by far the most abundant primate in the lowland rain forests of Costa Rica, at least on the Caribbean slope. The resident troop woke us up most mornings at 4am as the males greeted the day and proclaimed their dominance. We saw this troop from the safari boat on the Sarapique River, upstream from the docks at Puerto Viejo. The big male is pretty obvious. The female with the baby was good to see, and the young male was very active. There were several more in the troop, but they stayed deeper in and out of sight. Sony Rx10iv at 509mm equivalent (trying to get the tails in :). Program mode with my custom birds and wildlife modifications. Processed in Pixelmator Photo and Apple Photos. Mostly ISO 800, one at ISO 1000 and one at 640. f4 @ 1/500th.