Abstract
Phenotypic variations occur naturally in vertebrates. These variations are related to environmental, physiological, and genetic factors. Most variations in the pigmentation of the integument (skin, hair, feathers, scales, nails, etc.), or chromatic anomalies, originate due to the inheritance of an altered copy of genes related to the production of tyrosinase and melanin synthesis. Chromatic anomalies are classified as piebaldism, leucism, albinism, and melanism. This work presents the first record of piebaldism in the collared peccary (Dicotyles tajacu) in northeastern Mexico, being only the second record in the entire range. This finding was made during a monitoring conducted in 2023 at a site adjacent to the Sierra del Abra Tanchipa Biosphere Reserve, in northeastern San Luis Potosi, Mexico. This record contributes to the understanding of the distribution of chromatic anomalies in the Neotropical region, as well as their possible ecological implications.