Leucism in Callithrix jacchus (Primates: Callitrichidae) and Sciurus aestuans (Rodentia: Sciuridae) in the northeast of Brazil

Phenotypic variation is common in vertebrates, especially if we consider geographic variations, however, mutations such as leucism, melanism, and albinism are not so common. Here, we report two cases of leucism, in common marmoset (Callithrix jacchus) and Brazilian squirrel (Guerlinguetus aestuans), recorded in Atlantic Forest fragments in northeastern Brazil. These reports allow us to better understand this phenomenon, as well as ecological and physiological implications for animals, which have a significant influence on their survival.