In the last five years, scientists in Costa Rica have noticed a marked increase in Black Mantled Howler Monkeys — who are turning blonde. Howler Monkeys (called Congos in Spanish), comprise 69% of the primate population of the country. Howlers are renowned for their vocalizations made by adult males, which can be heard more than one kilometer away. They are called “mantled” howler monkeys due to the longish reddish-blonde hairs they have along the sides of their bodies. The rest of their bodies are covered with lush, jet black hair. But now scientists have noticed that these jungle creatures are beginning to change color, at an alarming rate.

Read more at: Mutant Howler Monkeys Appearing More Frequently In Costa Rica