This picture of a monarch caterpillar was taken on 11 Sep 2019 at 1:27pm.
According to [https://www.timeanddate.com/weather/usa/chicago/historic], weather conditions were partly sunny around the noon hour in Chicago, with a high of 90F and low of 86F, winds from the SW at around 16mph. Humidity was 57%.
There is one caterpillar in this picture, but nearby and not shown were two other caterpillars. An adult monarch was spotted flying at Franklin/Wacker, and another near the Wrigley building at Michigan and Illinois.
Two days ago, I saw two caterpillars on the other side of Wacker Drive, also on this block and the adjacent block (Merchandise Mart and west of Mart). There is not much milkweed left in the planters, and nectaring sources are increasingly few. The weather has turned warm this week, but was quite cool last week.
I have seen a total of four monarchs eclose on Wacker this summer, but have had far fewer adult monarch sightings here compared to 2018. I have also seen many failed chrysalises.
Latitude: 41.9 Longitude: -87.6
Observed by: Jeanette
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