Date: 02/04/2016

Number: 400

I have seen several hundred (~400) Monarchs in a tree grove on Mare Island in Vallejo. There are a lot of different variety of trees on the island due to the military history.

The group of trees I have found them in consists of a bunch of eucalyptus, but oddly enough they aren't landing on any of the eucalyptus. I think they mostly land on the cedars. There are a couple of big gardens on Mare Island, which I would assume is the source of nectar.

Residents on the island tell me that the butterflies usually stick around for a couple of weeks and then move on. I didn't see any huge concentrations or clumping, though I am told it happens. Beautiful sight to see, though concentration was somewhat spread out.

Vallejo, CA

Latitude: 38.2 Longitude: -122.2

Observed by: Chris
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