20 October 2009


I've seen flocks like this in Kentucky and Indiana. In the U.S. the roost locations for these immense gatherings often become contaminated with a fungus called Histoplasma capsulatum, which can cause human disease. Whether this is true in the U.K. or not, I don't know, because it also depends on characteristics of the underlying soil.

Here's an Audubon Magazine article about flocking behavior.


  1. Dr. Dawkins discusses and explains this phenomenon in his latest book The Greatest Show on Earth.

  2. When I was a kid this happened in my hometown in the midwest. The city asked a handful of hunters to help out. My dad and I went around town with 12 guages for days, the city did the clean up. They sounded like rotten apples when the hit the ground.


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