Western Tiger Swallowtail Caterpillar

what is this?
We found this in a tree next to our house, in cool, rainy Washington state. What is it???? We have never seen anything like it. Thanks,
The Dennis family

Dear Dennis Family,
This is a Western Tiger Swallowtail Caterpillar. You might have seen the adult butterflies which are showy large black and yellow striped butterflies.

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