MANTLED HOWLER MONKEY, RIO FRIO NEAR LOS CHILES, COSTA RICA, JANUARY 24, 2015
Pentax 55-300 at 300mm
1/400 sec. f9
It wasn't only birds we saw during our tour boat trip up the Rio Frio in northern Costa Rica. The trees were full of monkeys, especially the mantled howler species. Their howls can travel three miles through dense forests, and biologists think howling is the monkeys' version of social media, their way of keeping in touch with one another without having to move from their favorite branches.