Keel-Billed Toucan

===Subspecies=== Two subspecies are accepted, which intergrade where their ranges meet: {| class="wikitable " |- ! Image !! Subspecies !! Distribution |- ||| Ramphastos sulfuratus sulfuratus Lesson, 1830 || Found in southeastern Mexico, Belize and northern Guatemala. Red chest band below the yellow breast very narrow, often not visible. |- ||| Ramphastos sulfuratus brevicarinatus Gould, 1854|| Originally described as a separate species. Found in southeastern Guatemala to northern Colombia and just into the far northwest of Venezuela. Slightly smaller than R. s. sulfuratus, and with a somewhat broader red band on the chest. |- |}

The keel-billed toucan can be found from Southern Mexico to Venezuela and Colombia. This includes Belize, where it is the national bird. It roosts in the canopies of tropical, subtropical, and lowland rainforests, up to altitudes of . It roosts in holes in trees, often with several other toucans. Although the toucans reside in the forests of these areas, they can also be seen in neighboring plantations, pastures, and second-growth forests.

Like many other toucans, keel-billed toucans are very social birds and are rarely seen alone. They fly in small flocks of approximately six to twelve individuals through lowland rainforests. Their flight is slow and undulating, consisting of rapid wing beats (six to ten), then a glide with the bird's beak extending forward and dipping downward as though pulling the rest of the bird. Their feet are drawn up forward in flight. The flight distances are typically short. They live together in groups, often sharing cramped living quarters of holes in trees, where five or six birds could fit into a single hole together. The birds look for holes around between 3–27 m off the ground, with smaller holes for an entrance. In order to fit in these small holes, the birds fold their tail over their body and tuck the large beak along their backs. This position also keeps the birds' body temperature at a normal level while they sleep. Adding to the lack of space, the bottoms of the holes are often covered with seed stones from the fruit the toucans have eaten. There is a family structure within the group. Birds often "duel" with each other using their bills, and throw fruit into each other's mouths. They 'play ball', one throwing a fruit in the air and a second seizing it. Calls by the birds include sounds like "grr", "trrii" and "rrrk". A louder male can be heard from a kilometre away. They also communicate with non-vocal noises by clacking their large beaks and beating their wings. Predators include hawk-eagles and collared forest falcons, the latter a significant predator in some cases.

When courting, the birds will exchange fruit with each other. The female keel-billed toucan lays 1–4 white eggs in a natural or already-made tree cavity. The male and female share in the caring of the eggs, both taking turns incubating. The eggs hatch approximately 15–20 days after being laid. After hatching, the male and female again take turns feeding the chicks. When the chicks hatch, they have no feathers, and have their eyes closed for approximately 3 weeks. The chicks have adequately formed heel pads, which assist on the seed-covered bottom of the nest. The chicks stay in their nest for approximately eight to nine weeks while their bills develop fully and they are ready to fledge from the nest. Keel-billed toucans can have as many as 3 broods each year.

The diet of keel-billed toucans consists mostly of a wide range of fruit, such as Cymbopetalum mayanum (Annonaceae) and gumbo-limbo (Bursera simaruba), but may also include insects, eggs, nestlings, and lizards. The bill, surprisingly dexterous, allows this toucan to utilize a large variety of fruit that might not otherwise be reached. When eating the fruit, it uses its bill to dissect the fruit, and then tosses its head back to swallow the fruit whole. Typically, the toucan eats off the ground, from mid-story to the forest canopy. Rarely, it may eat on the floor of the forest. The keel-billed toucan is possibly the first toucan observed eating carrion, by a team of researchers in 2018 in Costa Rica. The toucan's diet has an effect on the plants that it eats, as large seeds digested and vomited by the birds have a higher chance of sprouting than those which are not eaten. Occasionally, the chestnut-mandibled toucan will follow the keel-billed toucan to a source of food, and then chase away the smaller bird. Ramphastos sulfuratus -Mexico-8a.jpg|R. s. sulfuratus in Mexico Keel-billed toucan (Ramphastos sulfuratus sulfuratus) in flight Peten.jpg|R. s. sulfuratus in flight, Peten, Guatemala Keel billed toucan costa rica (cropped).jpg|R. s. brevicarinatus in Costa Rica Ramphastos sulfuratus, Cerro Ancon Reserve, Panama City 395958583.jpg|R. s. brevicarinatus in Cerro Ancon Reserve, Panama

The keel-billed toucan is threatened by habitat loss, which has been accelerating in recent years, and by hunting and trapping for the wildlife trade. In 2015 a keel-billed toucan could fetch up to $2,000 on the illegal market. The species is undergoing a moderately rapid population decline and is therefore listed as a near-threatened species. The decline rate in 2021 of the past 3 generations was estimated to be from 10–19%, although future population declines were estimated at a higher 20–29%.

The keel-billed toucan is sometimes kept in captivity, but it requires a high-fruit diet and is sensitive to haemochromatosis, an iron storage disease. It and the Toco toucan are the most common toucans to be kept as pets.