Monkey yelling in the forest close to Palenque (Chiapas, Mexico).
Recored by a Sound Devices 788T with a CL8, with a MS Setup CCM41+CCM8 (MS is encoded in stereo Left-Right).
Same sound on freesound
http://www.freesound.org/people/felix.blume/sounds/172648/
More sounds on www.felixblume.com