Western Pygmy Marmoset Cebuella pygmaea
A very small New World monkey found in the northwestern Amazon rainforest in Brazil, Colombia, Ecuador, and Peru. It feeds on exudates (tree saps and gums) and insects.
Studies have shown that Cebuella pygmaea is potentially able to prevent reproduction in their population through hormonal suppression. If a single dominant female marmoset does not wish for her subordinate group members to reproduce, she can produce pheromonal signals which suppress hormones (LH secretion) which leads to ovulatory failure. However, this does not always work.
img source










