Every summer outside the tiny Mexican town of Nanacamilpa, a unique type of firefly puts on one of nature’s most incredible light shows. These insects are one of the dozen or so species of firefly that signal in a synchronized fashion. The males, taking to the air to woo females, flash a sparkling yellow that…

Just a few years ago, it looked as if humpback whale populations in the Pacific Ocean were booming. Receding sea ice due to climate change—though bad for polar bears and other wildlife—had lengthened the summer foraging season for hungry whales, and the U.S. government decided that certain populations had recovered enough to be taken off…