Extinct Rocky Mountain locust Melanoplus spretus

The extinct Rocky Mountain locust formed the largest swarms of any insect in recorded history.

One swarm that passed over Nebraska, USA in 1875 was estimated to have covered 198,000 square miles and it probably contained 3.5 trillion locusts.

National programs were developed to exterminate it, leading to the locust’s extinction in 1902. Only a few hundred specimens exist in museums worldwide and the Natural History Museum has several.