Though it is a primarily insectivorous species, it has been seen also to eat the seeds of mayten and the fruit of leñadura.
Trees from Tierra del Fuego: Drimys winteri, Maytenus magellanica, Embothrium coccineum, Nothofagus antarctica, Nothofagus pumilio, and Nothofagus betuloides, have thrived too, in this cold oceanic climate.