Date: 09/01/2020

Number: 300

This is known roost site on the shore of Lake Huron near Tobermory. Monarchs gather here after crossing Lake Huron/Georgian Bay. Some years there are many hundreds more than we saw tonight.

Many in the gardens throughout the day, but gather in the trees on the road between 7:00 - 7:30 pm. Butterflies swirl overhead until choosing a roost location. Very little movement after 7:45 pm.

Many butterflies in the gardens through August, but didn’t see the usual concentration roosting along the road until Sept 1 but may have begun earlier.

Butterflies tend to roost in clusters - estimated numbers x no. of clusters

Overnight temp was 15 C?
Strong SW winds to 30 km/hr yesterday, butterflies sheltering on lee side of cedar and black spruce trees on the lakeshore, not an issue on the road.



Here’s a link to more videos on my twitter account…
https://twitter.com/peter_rasberry/status/1301366559676473346

Warner Bay, ON

Latitude: 45.2 Longitude: -81.6

Observed by: Peter
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