The above marmoset, living with a Black-tailed Marmoset, would appear to be a hybrid, possibly
of a Black-tailed (Callithrix/Mico melanurus) and a White-tufted/Common (Callithrix jacchus).
It has some of the Black-tailed traits but a back and tail more like the White-tufted or even the Geoffroys
(Callithrix geoffroyi), but the ear tufts indicate the former.
This younger marmoset living with them also has traits of Black-tailed and White-tufted.
It may be the child of the first suspected hybrid (although marmosets usually have twins).