ducks enjoying snow - a photo on Flickriver

            Ducks, as well as many other birds, have a counter-current heat exchange system between the arteries and veins in their legs. Warm arterial blood flowing to the feet passes close to cold venous blood returning from the feet. The arterial blood warms up the venous blood, dropping in temperature as it does so. This means that the blood that flows through the feet is relatively cool. This keeps the feet supplied with just enough blood to provide tissues with food and oxygen, and just warm enough to avoid frostbite. 
   

Taken on: February 28, 2015

Tags:

ducks

snow

nature

beautiful

white

creek

water

Lebanon

Animal Planet

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birds

cold

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Millie

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Sets appears in: • Winter • Birds

Groups appears in: • Central Pennsylvania Shutterbugs • Water Birds more » • - I LOVE NATURE - • NATUREPIX • Awesome Nature • *I Love Birds* • Animal Planet • Nature Heals the Soul • Beautiful Earth • TMI: your ART & NATURE **NO PEOPLE OR MAN-MADE OBJECTS** P1♥C1 • Birds Of Pennsylvania • Birds (no rules) • Birds Photos - Check out the new discussions! • " ALL ANIMALS ( no people, no b&w, read group rules please) • Birds birds birds birds! • Beauty of Life • I Love My Canon Powershot SX (all sx type camera's) • Animals/Birds of Planet Earth • Canon SX30 / SX40 / SX50 / SX60 / SX70 • Amateur Wildlife and Nature • Amateur Exclusive • *Animal Photography Group* (NO CAGES/ENCLOSURES) • ` FLICKR ´ • Canon SX40 to SX70 and other Canon SX Bridge Cameras • "Watch The Birdie" P2 C2***Only birds*** NO OTHER IMAGES • Pennsylvania Amateur Photographers • Canon SX50 HS • Webshots Community • Photographers aged 50 + • Sube lo que quieras / Up what you want • Images About Almost Anything • Photo's passion of the world • Canon Superzoom Bridge Camera Group - SX70, SX60, SX50, SX40... • anything you wish... • Worldwide Fauna • This is Why I Bought A Camera • Natural variety / fauna - flora - sceneries « less

Camera: Canon PowerShot SX50 HS, f/6.3, 1/80 sec, 30.1mm, ISO 100 (more info) (hide info)

Camera:	Canon PowerShot SX50 HS
Aperture:	f/6.3
Exposure Time:	0.013 sec (1/80)
Focal Length:	30.1mm
ISO:	100
Exposure Bias:	0 EV
Exposure Mode:	Manual
White Balance:	Manual
Color Space:	sRGB
Software:	Adobe Photoshop Elements 13.0 (Windows)
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