I found this thing attached to my wall next to my garden. I live in Simi Valley, California, USA.

At first I thought it was a caterpillar and I left it alone, but after 2 or 3 months I don’t think it is a caterpillar anymore. I touched it today for the first time and it moves. What is it?

enter image description here

  • $\begingroup$ What is the approximate size? Maybe 3cm? $\endgroup$
    – Remi.b
    Commented Jan 16, 2019 at 22:57
  • 1
    $\begingroup$ It is About 1.5-2cm $\endgroup$ Commented Jan 17, 2019 at 15:05

1 Answer 1


This is very likely a chrysalis (or pupa) stage of a lepidopteran.

A similar looking example belongs to the giant swallowtail butterfly (Papilio cresphontes).

enter image description here

Source: Bill Frank

P. cresphontes is found in southern California [source], so it would not be unreasonable to find it in Simi Valley.


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