Howler monkeys have beards and long, thick hair which may be black, brown, or red. The red howler species is the most common, but it is often targeted by hunters eager for bushmeat. Other species ...

My adventure of a lifetime began in 2015 when I was asked to follow the tree-top lives of Costa Rica’s gravity-defying howler monkeys (Alouatta palliata palliata). Image by Justine Allan.

However, rapid urbanization and a lack of conservation awareness threaten its iconic species. In Nosara, howler monkeys are paying the price: deforestation, uncovered transformers, and unregulated ...