For years, scientists have been puzzled about the number of bats found dead near wind power farms showing no signs of outward injury. But now, a new study published in Current Biology indicates that internal hemorrhaging, or bleeding, caused by bats suddenly flying into areas of low pressure created by the spinning turbines is responsible for the high rate of bat deaths. At one facility, 188 bats were killed in one night, but of the 87 which had no external injury like a laceration or broken wing, nearly 90% had severe internal bleeding mostly from the lungs. This is yet another dilemma for the debate over Green energy and species protection.