elephant ear sponge
... that the elephant ear sponge is said to resemble a piece of tanned cow hide?
... that the <b id="mwDmw"><a href="./Agelas_flabelliformis" id="mwDm0" rel="mw:WikiLink" title="Agelas flabelliformis">elephant ear sponge</a></b> is said to resemble a piece of <a href="./Tanning_(leather)" id="mwDm4" rel="mw:WikiLink" title="Tanning (leather)">tanned</a> <a href="./Hide_(skin)" id="mwDm8" rel="mw:WikiLink" title="Hide (skin)">cow hide</a>?