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Spotted Marsh Frog, Limnodynastes tasmaniensis

Hunter Valley, NSW, Australia

Does this smile look forced? The red 'mouth' you see here is actually the frog's expandable throat which allows it to stay under water for extended periods of time and is also used when calling/croaking.

All frogs start life as aquatic tadpoles, breathing underwater through internal gills and their skin. Most later develop into land animals with lungs for breathing air. In all stages breathing is controlled by pulsing the throat. Most frogs lose their gills when they metamorphise.

Frogs breath with their mouths closed. Their throat movements pulls air through the nostrils to the lungs. They breathe out with body contractions.

Air in the throat and lungs can also help in water, giving a frog better buoyancy and making it float more easily.

Frogs can also breath through their skin, with tiny blood vessels, capillaries, under the outer skin layers.

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Flash Set-up:

Canon Speedlite 580EXII @ 1/4 power, 50mm zoom directed at subject, through diffuser, above camera left

triggered by Yongnuo RF-602 Tx/Rx.

Yongnuo YN460 @ 1/2 power, camera left, directed to background behind subject

triggered by Yongnuo RF-602 Tx/Rx.

Canon 450D, 60mm f/2.8 Macro lens, 1/200s, f/8, ISO100

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