This is an Elephant Snail. A healthy, lively and perfectly fine Elephant Snail. It looks like it survived a particularly brutal stepping on. And then maybe it ate its assailant and now wears the sole of his jogging shoe as a sickeningly macabre but also hilariously ironic trophy.
Or maybe that just happens to be what they look like? It's difficult to say...
|Image: WoRMS for SMEBD|
Video: sensitive NAG
What's that? *blah-blah-blah, kerfuffle-kerfuffle*
The shell on these oddballs reaches about 10 cm (4 in) long or a little more and the whole thing can be covered up by flaps on the side so it looks like a giant, black slug. Apparently they mainly show off their shell when disturbed, perhaps to scare off attackers by demonstrating the fact that they ate a guy and now they have his shoe.
They come from the coast of southern Australia and New Zealand, where they spend the day hidden among the rocks and come out at night to feed.
Although I'd really like to see one with a high heel on its back.