Thin density swarm (swarm visible only when near enough for individual locusts to be discerned) 1 020106 2014-09-03T09:55:02.752Z Medium density swarm 2 020106 Isolated hoppers seen singly 4 020106 Locust population density Dense swarm (obscuring nearby features, e.g. trees) 3 020106 1 Missing value 15 020106 Scattered hoppers, several visible simultaneously 5 020106