their heads. During this phenomenon they also get goose bumps. The reasoning behind it is believed to reduce attacks and increase the chances of the predator leaving. This "mobbing behavior" usually happens without infants involved. When there is an infant involved the coppery titi monkey will hide farther away, though still making the alarm calls. Out of all observations, the longest alarm call went over 40 minutes. When there is a threat in the area, it is usually the male making the call, and if there is an infant, he is protecting the infant. References External links Primate Info Net Factsheet coppery titi Mammals of Brazil Mammals of Peru coppery titi Taxa named by Johann Baptist von Spix