There's a museum out here which preserves American farm machinery and implements. They have an interesting exhibit about a plow invented which buried seed instead of strewing it loosely. Apparently, in the early homesteading days, clouds of passenger pigeons used to swarm behind horse or mule drawn plows and eat the seed as it was sown; this made the birds and the farmers natural enemies. The birds lost until Hitchcock made his movie.
Fortunately there are still plenty of the other kind.
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