Extreme close up of a male Black Howler monkey looking sad while resting on a tree

alouatta caraya howler black male sad eyes tree lonely expressive monkey sadness animal baboon ecosystem forest habitat jungle mammal nature primate rainforest rest tropical south american blackandgold alouatta looking loneliness depression zoo howl loud evolution ancestor concept body language emotion nonverbal communication unspoken shallow focus locked off static nobody no people outdoors close up closeup extreme close up ecu