Date: 09/25/2019

Number: 500

Butterflies were roosted all along the tree line on the west side of the road

Editor's note: contacted observer for more details on this sighting

- I don’t know the date the roost first formed. I know that it had butterflies roosting on 9/25 and 9/26. It was observed in the morning hours both days, around 0900.

-The numbers were a rough estimate. I strongly suspect that it was a conservative estimate.

-There was a lot of goldenrod in nearby fields as well as a strong New England aster component.

- The over night temperatures were low 60’s high 50’s the two nights that I know the butterflies were present.

- I don’t know the wind direction overnight, but I know that during the day on the 26th, there was a north wind and the majority of the butterflies left the roost. Less than 50 butterflies remained at the this site on the evening of 9/26. I checked it again on the morning of 9/27.

Lyons, IN

Latitude: 39 Longitude: -87.1

Observed by: Deanna
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