I've talked about why despite their slow rap, snails are actually awesome -- but if there's a creature more seemingly boring than a snail, it's the sponge. Evolutionarily, sponges are among the oldest, most basal multi-cellular animals, and as such, they're very simple, lacking organs and the ability to move -- but despite this, they've come up with some clever body engineering. Read more
Why Poriferans (sponges) are awesome
Sponging dolphins: cute & clever
Did you know that dolphins use tools, and look adorable while doing so?
Bottlenose dolphins in Australia's Shark Bay like to snack on seafloor-dwelling fish (like sandperch), a food choice that presents two problems. First, these fish lack swimbladders and therefore cannot be echolocated effectively; second, the substrate they inhabit is scattered with sharp rocks and shells, which obscure the fish and conspire to injure a dolphin's nose. One group of dolphins came up with a clever way to enjoy their benthic prey: they harvest sponges and wear them on their faces. The sponge protects the dolphin's rostrum while it digs around in the seafloor, until it runs into a fish and scares it out of the ground to be eaten. After about an hour, when the sponges become too worn down to serve as a shield, the dolphins replace them with fresh ones. Furthermore, the dolphins pass the knowledge of sponging on from generation to generation. Read more details in this scientific paper.