In terms of dimensions, it has a length of approximately 12 cm and a wingspan between 17.5 and 20 cm. Regarding its characteristics, the most noticeable aspect is the color pattern of its head, with a white face, blue eye stripe, and blue crown. The down on the underside is yellowish and on the upper side greenish. Juveniles have similar color patterns, but with less vibrant colors.

This species feeds on insects and larvae in spring and summer, and on seeds, fruits, and berries in autumn and winter. It is frequently observed in garden feeders. It reproduces between April and July and makes nests in tree cavities where it places moss, fur, and feathers. It also uses artificial nest boxes. After building the nest, the female lays between 7 and 12 eggs, and incubation lasts about 12 to 16 days. After the chicks hatch, both parents feed them for 16 to 22 days. At the end of this time, the chicks are ready to leave the nest, but are fed by their parents for a few more weeks.