A frog's stomach!
One of many reasons frogs are so adaptable is their characteristic thin layer of permeable skin. It allow air to pass through and, in most species, water does as well. Oddly, most frogs rarely need to drink since their skin easily absorbs the water they need. Some frogs have stomach skin so porous that it can soak up moisture from surrounding soil. Frogs must, however, eat regularly and usually subsist on a diet of insects and worms captured with their sticky, forked tongues. Some large tropical species are also capable of preying upon snakes and small mammals.
Lucky for all you 'View from the Microscope' fans, I have a histological slide of that as well!
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