13 Dolphins Found Beached On Cape Cod

What the hell is going on here? This story really freaked me out. I wonder what causes marine life to beach themselves like this. Is it something that we humans are doing (like sonar signals or pollution) or is it global warming? Maybe even naturally occurring? Too weird. Oh, and the last line is the freakiest part: "Since Dec. 10, 2005, 55 dolphins and 18 pilot whales have been found stranded on Cape Cod." The Boston Channel