“Experts say that more than 100 types of robots are active at Fukushima, including scores of modifications on a handful of basic designs. They’ve been likened to scorpions, snakes, giraffes and amphibians. They fly, walk, crawl and make underwater maneuvers, braving dust, debris and doses of radiation that could kill a human being. Their variety underscores the size — and complexity — of their task.”
Source: At Japan’s Fukushima nuclear complex, robots aiding the cleanup after 2011 disaster – LA Times