The research group from the University of Costa Rica (UCR), led by Dr. Óscar M. Chaves, has been investigating the unusual coloration in howler monkeys (Alouatta palliata) from 2021 to 2023. Typically ...
Abnormal or unusual pigmentation always raises the possibility of a melanocytic tumour. Other conditions including melanosis, foreign bodies, systemic and topical medications, and exposure to ...
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