According to Professor Google:
The Desert Locust, Schistocerca gregaria, forms the largest swarms. In early 1954, a swarm that invaded Kenya covered an area of 200km2. The estimated density was 50 million individuals per km2 giving a total number of 10 billion locusts in that swarm.
Wow!
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johnbartels.com 
Wow. That is incredible. Do they feed on the local crops? I would be worried if I was a farmer and saw that!
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