any of about 12 species of small and relatively short-billed toucans of the genera Aulacorhynchus and Selenidera, 25–35 cm (10–14 inches) long, belonging to the toucan family, Ramphastidae. Mainly green with touches of bold colour, they range from the lowlands of southern Mexico and Brazil to the high Andes. The emerald toucanet (A. prasinus) has the widest range.