Black-pencilled (or black-tufted) marmosets (Callithrix penicillata) are native further north in Brazil, but they were introduced into this area. Besides tree sap and bark they also eat invertebrates, bird eggs and young that are still in the nest. This unnatural mortality appears to be a problem for some bird species. It is almost never a good idea to introduce non-native species, and, while it is very cute to watch monkeys stuff their faces with banana, feeding of wildlife - native or not - typically results in a suite of problems and is therefore best avoided.

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The receptionist from the Hotel Chapadão da Canastra feeds banana to black-tufted marmosets (Callithrix penicillata), São Roque de Minas and Parque Nacional da Serra da Canastra, Minas Gerais, BrazilThe receptionist from the Hotel Chapadão da Canastra feeds banana to black-tufted marmosets (Callithrix penicillata), São Roque de Minas and Parque Nacional da Serra da Canastra, Minas Gerais, Brazil The receptionist from the Hotel Chapadão da Canastra feeds banana to black-tufted marmosets (Callithrix penicillata), São Roque de Minas and Parque Nacional da Serra da Canastra, Minas Gerais, BrazilThe receptionist from the Hotel Chapadão da Canastra feeds banana to black-tufted marmosets (Callithrix penicillata), São Roque de Minas and Parque Nacional da Serra da Canastra, Minas Gerais, Brazil