THE FROG THAT NEVER NEEDS AN X-RAY

In the trees of South and Cen­tral Amer­i­can jun­gles, you will find glass frogs of 2-8 cm with trans­par­ent skin.

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Glass frogs are fa­mous for their thin and partly trans­par­ent skin, par­tic­u­larly that of the belly. The skin is be­lieved to pro­vide cam­ou­flage, as the frog is hard to see for preda­tors.

Fe­males lay 20-30 eggs which, like the in­ter­nal or­gans, can be seen clearly through the skin. Males pro­tect the eggs after their lay­ing, keep­ing them clear of par­a­sites.

The frog’s or­gans are cov­ered by a layer of pig­ment cells (iri­dophores), which can re­flect and pro­tect them against sun­light and heat. The frogs can grow 10+ years old.

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