Found on native milkweed while pruning today: A specimen that looks like it could be a pupa or some type of chrysalis.
We’ll investigate.
In the meantime, does anyone have a butterfly net or pop up display cage where we can place it outside?
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Concord Village EarthLab 
I’d say it looks like the pupa of a moth perhaps one related to the cecropia moth.
interesting. thank you! I will look up cecropia moth.
Promethea is another possibility judging by the narrowness of the cocoon. It is related to the cecropia moth.