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The toucan beak serves several functional roles for the toucan such as acting as a thermal regulator for heat exchange, a tool in feeding, and a method of defense. The toucan has an extreme beak size, with the beak accounting for approximately forty percent of the bird's total body surface area.
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 lettered aracari is the smallest species of toucan. Toucans range in size from the lettered aracari (Pteroglossus inscriptus), at 130 g (4.6 oz) and 29 cm (11 in), to the toco toucan (Ramphastos toco), at 680 g (1.50 lb) and 63 cm (25 in).
The largest species of this order is the toco toucan (Ramphastos toco) of the neotropic forest. Large specimens of this toucan can weigh to 870 g (1.92 lb) and 0.65 m (2.1 ft), at which size the beak alone can measure approximately 20 cm (7.9 in). [126]
Plate-billed mountain toucan. A. laminirostris Gould, 1851: Southeastern Colombia to southern Ecuador NT Unknown [29] Hooded mountain toucan. A. cucullata (Gould, 1846) Southeastern Peru to central Bolivia LC Unknown [30] Black-billed mountain toucan. A. nigrirostris (Waterhouse, 1839)
A Toco toucan watches its surroundings in a photograph taken on a recent safari to the Pantanal of Brazil. Helen Blazis of Grafton recently returned from leading a safari to the Pantanal of Brazil.
The toco toucan, which has the largest beak relative to the size of its body of any bird species, is capable of modifying the blood flow to its beak. This process allows the beak to work as a "transient thermal radiator", reportedly rivaling an elephant's ears in its ability to radiate body heat. [100]
Here’s what scientists do know: The ovaries are oblong glands each about the size of a kiwi. They’re responsible for the production and secretion of at least two essential hormones ...