How birds beat the heat Part 1 of 3
Sep 11, 2018
Part 1 of 3
An old etiquette saying maintains that “horses sweat, men perspire and women glow.” There’s no mention of what Turkey Vultures do. Probably with good reason – they urinate and defecate on their feet to stay cool!
When summer temperatures soar, and the air resembles warm, sticky molasses, be thankful for that rivulet of perspiration coursing down your back – as the water evaporates, it cools you. Besides sweating, we beat the heat of brutal summers by enjoying air conditioning or fans, swimming holes and tall, frosty beverages. We also slow down and show a lot more skins than we normally do. To stay cool, birds do variants of all of these things, too…. with one exception.
Birds can’t sweat – they don’t have any sweat glands. To avoid over-heating and sudden death, many birds pant to cool off. Heat wand water vapor are perspired into air sacs, carried to the lungs, and exhaled through the mouth. Some non-passerine birds expel excess heat with a “gular flutter” – a rapid vibration of the upper throat and floor of the month.
Next time in Part II – more cooling techniques!