Pygmy marmosets are the world's smallest monkeys with highly specialized behavioral needs. Understanding their natural behavior is essential for providing good captive welfare.
Pygmy marmoset behavioral welfare requires meeting their gummivore foraging drive — the most time-consuming behavior in wild animals. Without bark-gouging substrates and gum supplementation, marmosets cannot express this fundamental behavior, leading to behavioral abnormalities. Cooperative infant care is another welfare-critical dimension; single pairs without helper family members show reduced reproductive success and higher stress. Ultrasonic vocalizations should be considered in welfare assessments — inaudible distress calls may go undetected by human observers using standard welfare monitoring.