Date: 09/30/2019

Number: 73

This is the 3rd consecutive year Monarchs have been observed congregating at nightfall in these exact same large old Arborvitae trees (yet not in any of the other trees in the same park that are the same kind and age). The ratio of Monarchs roosting on each tree is similar to last year and it even seems like they might be roosting on the same branches as last year. Most roost branches were on the north side of the trees and would be visible to incoming fall migrators - could they be leaving a marker that remains on the tree that's visible on the light spectrum that Monarchs can perceive for butterflies to see the following year?

Lincoln, NE

Latitude: 40.8 Longitude: -96.7

Observed by: Shari
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