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The colorful and large bill, which in some large species measures more than half the length of the body, is the hallmark of toucans. Despite its size, the toucan's bill is very light, being composed of bone struts filled with spongy tissue of keratin [7] between them, which take on the structure of a biofoam. [8]
Toucans are typically characterized by their large, ... They are arboreal and nest in tree holes laying 2–4 white eggs. ... The modern toucan species, ...
The female keel-billed toucan will lay 1–4 white eggs in a natural or already-made tree cavity. [10] The male and female share in the caring of the eggs, both taking turns incubating. [8] The eggs hatch approximately 15–20 days after being laid. After hatching, the male and female again take turns feeding the chicks.
The chestnut-mandibled toucan is a resident breeder in moist lowland forest. The 2–4 white eggs are laid in an unlined cavity high in a decayed section of a living tree, or occasionally in an old woodpecker nest in a dead tree. Both sexes incubate the eggs for at 14–15 days, and the toucan chicks remain in the nest after hatching.
The largest known birds whose nests are predated upon by the toco toucan are the hyacinth macaw and buff-necked ibis; the nestlings of the latter weigh 200–300 g (7.1–10.6 oz), compared to the toucan's body mass of around 540 g (19 oz), and are killed by breaking their necks with sideways movements of the toucan's beak. [33]
The breeding season extends from March to October, peaking in May through August. The bird nests in tree cavities up to 30 meters above the ground. The clutch contains 2 or 3 white eggs. The eggs are incubated for about 16 days and the young fledge at 46 to 60 days. Once the young depart, the pair may rear a second brood.
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The red-breasted toucan or green-billed toucan ... Both adults incubate the eggs and both provision nestlings. The incubation period is about 16 to 19 days and ...