21. The Deep-Sea Glass Squid (Cranchiidae sp.)
Newly described species of deep-sea glass squid have bodies so transparent they’re nearly invisible in the water column. This striking adaptation helps them avoid predators in the vast, open midwater zone of the deep sea. Their delicate, ghostly appearance has fascinated marine biologists and highlights the ingenuity of nature’s camouflage. Find out more about these remarkable squids at Ocean Conservancy.