Golden Elephant Snails Yakov Oksman / Getty Images The mango-colored golden elephant snail (Tylomelania zemis), otherwise known as the rabbit snail, has several distinguishing features.

The Galapagos snail — once collected by Charles Darwin — and South Africa's riverine rabbit are among 12,259 known plants and animal species facing extinction, according to the 2003 Red List ...

Draw a rectangle in the proportions of the golden ratio, then draw consecutively smaller 'golden rectangles' within it and join diagonal corners with an arc. The result is a perfect snail shell.