I'm the Naturalist at South Padre Island Birding & Nature Center.
A cold front at the beginning of the week seemed to have stalled migration and dropped lots of Monarchs all over South Padre Island. I saw them fluttering around everywhere I went on the island. At the birding center, I saw more than 20 at a time on different corners of the sanctuary. In the evening I saw several small clusters roosting in the mangroves and in the trees surrounding our building. Didn’t get any photos of the small clusters roosting.
They stuck around for a couple of days. Once the winds shifted, coming from the south again, most of them left. I noticed very few of them today (3/18) compared with earlier in the week. SPI is like a big monarch waystation and at times we can see large concentrations during the fall migration time. Quite a spectacle to witness!
I estimate I saw around 75 maybe a few more. From my experience, I'm not used to seeing that many Monarchs here during the Spring, so I was pretty surprised to see them in these numbers recently. The largest Spring migration I've seen here.
I've never witnessed roosting behavior before, I saw a couple of clusters, not many.
South Padre Island, TX
Latitude: 26.1 Longitude: -97.2
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