Monarch butterflies migrating up to 4,000 km from Canada to the mountain forests of central Mexico navigate by the Sun while continuously correcting for the time of day

Monarch butterflies migrating up to 4,000 km from Canada to the mountain forests of central Mexico navigate by the Sun while continuously correcting for the time of day

Monarch butterflies migrating up to 4,000 km from Canada to the mountain forests of central Mexico navigate by the Sun while continuously correcting for the time of day