it on different surfaces to show sexual attraction. Aggressive males will usually arch their backs with all of their limbs straightened. When in the presence of a predator the night monkey will sway from side to side to try and deter the predator. A rejection bite is used as tactile communication between mother and offspring after suckling or after around one week old when contact is not welcome. Father and offspring also use a rejection bite when the offspring reaches around 8 weeks when contact is not welcome. References Spix's night monkey Mammals of Colombia Mammals of Brazil Mammals of Ecuador Mammals of Peru Spix's night monkey Taxa named by Johann Baptist von Spix