Monarch Butterflies Are Losing Their Navigational Abilities. You Can Guess Why
Each fall, millions of eastern North American monarch butterflies migrate up to 3,000 miles south to the mountains of central Mexico, then return to their northern range in the spring. These winged insects rely on a complex navigation system to go to and from their overwintering sites, and new research suggests climate change may be messing with it. Monarch butterflies have two distinct biological “compasses.” The primary one infers direction based on their circadian rhythm and the position of