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 The emerald toucanet (Aulacorhynchus prasinus) is a species of near-passerine bird in the toucan family Ramphastidae. It is found from Mexico to Nicaragua.
 The emerald toucanet was originally described in the genus Pteroglossus. For many years it was treated as having at least 14 subspecies. In 2008 the International Ornithological Committee (IOC) split 10 of those subspecies to create seven new species and retained four of them as subspecies of their current emerald toucanet sensu stricto. BirdLife International's Handbook of the Birds of the World (HBW) concurred. Some of the seven have since been merged resulting in the current (2022) Wagler's toucanet (A. wagleri), blue-throated toucanet (A. caeruleogularis), white-throated toucanet (A. albivitta), and black-throated toucanet ( atrogularis) in addition to the emerald toucanet. 
 However, the North and South American Classification Committees of the American Ornithological Society and the Clements taxonomy declined to follow them. In 2017 they did split the emerald toucanet into two species, the northern (A. prasinus) and southern (A. albivitta) emerald-toucanets, each with seven subspecies. They treat the IOC's "emerald toucanet" as four subspecies of the northern emerald-toucanet.
 Four subspecies of emerald toucanet are recognized by the IOC and HBW:
 Like other toucans, the emerald toucanet is brightly marked and has a large bill. Adults are 29 to 37 cm (11 to 15 in) long and weigh about 150 to 240 g (5.3 to 8.5 oz). The sexes are alike in appearance although the female generally is smaller and shorter-billed. Their bill has a black mandible, a yellow maxilla with a black patch near the nares, and a white vertical strip at its base. All subspecies have plumage that is mainly green like that of other members of genus Aulacorhynchus, and is somewhat lighter below than above. The nominate's crown has a bronze tinge and its nape and upper back a yellowy bronze tint. Their eye is dark brown surrounded by even darker bare skin. Their lower face and throat are white. Their flanks are bright yellow-green to green-yellow and their undertail coverts and the underside of the tail are chestnut. The base of their tail's upper surface is green becoming blue towards the end and the tips of the feathers are chestnut. Subspecies A. p. warneri has a yellowish wash on its throat and some yellow on the face. A. p. virescens is slightly smaller than the nominate. It has a yellower face and throat, more yellow on the flanks, and darker chestnut tips on the tail feathers. A. p. volcanius is similar to the nominate but paler overall and slightly smaller. Immatures are grayer than adults and the chestnut of the tail tips is browner and smaller.
 The subspecies of emerald toucanet are found thus:
 The emerald toucanet primarily inhabits humid montane forest but is also found in more open landscapes like secondary forest, shrublands, pastures, and plantations. In elevation it ranges from near sea level to at least 3,000 m (9,800 ft).
 The emerald toucanet is non-migratory.
 The emerald toucanet is gregarious and frequently gathers in groups of up to about 10.
 The emerald toucanet forages by gleaning, usually while perched. Its diet is eclectic and includes a wide variety of fruits, invertebrates of many orders, and vertebrate prey such as birds, eggs, lizards, and snakes.
 The emerald toucanet's breeding season is from March to July. It nests in tree cavities, either natural or those abandoned by woodpeckers. They can be as high as 27 m (89 ft) above the ground. The typical clutch size is three or four but can range from one to five. Both sexes incubate the eggs but the female does so more than the male. The incubation period is 16 days and fledging occurs 42 to 45 days after hatch.
 
 The emerald toucanet's call is "a nasal, barking Wok!-Wok!-Wok!-Wok!-Wok!-Wok!-Wok!...". It also makes "a growling, throaty wra'a'a'a'a'a'ak".
 The IUCN has assessed the emerald toucanet as being of Least Concern. It has a very large range but its population size is not known and is believed to be decreasing. No immeditate threats have been identified. However, it "is vulnerable to habitat destruction".
 The emerald toucanet is a popular pet toucan. It is affectionate when hand-fed and loves to play and interact with its owner. Emerald toucanets are as quick to learn tricks as cockatoos. They are active and need a large cage for their size, including perches that they can hop back and forth on. They also require a high-fruit diet, without which they are susceptible to a disease of excessive iron storage that is similar to hemochromatosis in humans.[citation needed]