Description Young Howler Monkey Peeking out From Guassimo Trees in Playa Negra, Guanacaste Costa Rica. Guanacaste is one of just 3 Dry-Tropical Forest climates in the world. Thanks to a focus on eco-tourism the Howler Monkeys are doing well. They move throughout the region in 'tribes', each with a dominant male. The leader can often be heard in the early mornings with a deep throaty call that booms through the quiet of the forest. I have had the pleasure of watching them in our yard for hours; seeing 'the Dad' wrap his arm around a mother and child, adults affectionately kissing, joyfully searching for and chomping on the most tender new Guanacaste leaves or maranon fruits, and youngsters frolicking through the branches.