Date: 09/11/2015

Number: 5000

It was just before sundown, noticed that the line of trees in the back yard was looking like it had already started to have it's leaves turn brown, then noticed a few monarchs flying around the tree tops, them more and more were arriving from the north and landing in the trees, upon closer inspection, the leaves of the trees had not started turning brown, the trees were completely loaded with monarch butterflies settling in for the night (9/11). We watched them until it got too dark, and they were all gone by the time we went outside the next morning (9/12). There had to have been thousands in the 10+ trees that we saw them in.

Editor’s note: Observer confirmed 9/11 is the night the roost formed.

Morris, IL

Latitude: 41.4 Longitude: -88.4

Observed by: Christina
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