An octopus swims at the Ocearium in Le Croisic, western France, on December 6, 2016. (Photo by LOIC VENANCE / AFP) (Photo credit should read LOIC VENANCE/AFP/Getty Images) ...

When we talk about animals, we often picture creatures with bones– the kind that help them stand, swim, fly, or crawl. But not every animal is built that way. In many parts of nature, there are ...