Pleuroncodes planipes, or red crabs, swarm like insects across the ocean floor in a coastal eastern tropical region of the Pacific near Panama. This swarming behavior, never before seen among red crabs, was filmed using submarine video and autonomous underwater vehicle (AUV) photographs.<br />Read the article: http://arstechnica.com/science/2016/04/massive-undersea-crab-swarm-caught-on-video-for-the-first-time/