The southern limit of P. miltoni's distribution is marked by steep hills forming a terrestrial barrier.

[4] P. miltoni was not found along the left side of the Roosevelt river, and was instead replaced by Prince Bernhard's titi.

[4] Amazonian distributions of titi monkeys are limited by rivers, given that they cannot swim and forest habitat specificity.

[6] Milton Titis are found in the high (canopy) and medium (undercanopy) strata of the ombrophilous forest.

[4] Its habitat biome is also known to be more precisely referred to as terra firme (tropical moist), or Amazonian lowland forests.

[4] Group communication was found to be related in some cases to fruit availability (which is during the rainy season) and territoriality.

[4] Titis can easily jumps between trees and branches, as defined by their German name, Springaffen.

[4] The titi monkey sub-family Callicebinae is the most species rich of primate taxons,[11] and yet was previously considered as monogeneric under the genus Callicebus.

[13] This was because of rivers that created reproductive barriers that caused a form of allopatric speciation, and could be a contribution into the great diversity of the sub-family Callicebinae (the titi monkey family).