Posing as black market gorilla buyers, the rangers recovered the infant male unharmed inside a backpack and arrested three poachers, who were seeking to sell the gorilla—now named Shamavu after his rescuer-for as much as U.S. $40,000, according to park authorities.

Shamavu is the fourth baby gorilla Virunga rangers have recovered from poachers in 2011—the highest number on record in a single year, suggesting that baby-gorilla trafficking may be on the rise in the region.

(via Pictures: Baby Gorilla Rescued in Armed Sting Operation)