The toucan's bill is a vascularized structure that can also act as a radiator of heat. As revealed from thermal imaging, toucans can restrict blood flow to the bill when cold, and when warm ...

These Toco toucan chicks are one week old. This image accompanied the research article "Heat Exchange from the Toucan Bill Reveals a Controllable Vascular Thermal Radiator," by G.J. Tattersall et ...