Its bill is hollow and reinforced by an internal network of bony struts: it weighs a tiny fraction of the body despite being a third of its total length.
From Keel-billed Toucan
That bill works as a radiator: toucans regulate their body temperature by sending more or less blood through it, and a thermal camera shows it lighting up and cooling down over the course of the day.
From Keel-billed Toucan
It sleeps in tree holes with its tail folded over its back and its bill tucked under its wing feathers: several adults may share the same cavity, packed tightly together.
From Keel-billed Toucan
It has the largest bill relative to body size of any bird, up to 20 cm long.
From Toco Toucan
It uses the bill to shed heat through its blood vessels, regulating its body temperature.
From Toco Toucan
The chicks hatch entirely blind and featherless.
From Toco Toucan
A toucan's bill, for all its size, weighs very little: it is hollow inside and reinforced by a network of bony struts, a structure engineers have studied as a model for lightweight, strong materials.
From Red-breasted Toucan
That bill also works as a radiator: toucans regulate their body temperature by sending more or less blood through it, and can shed a significant part of their heat through it within minutes.
From Red-breasted Toucan

Ecosystems