A big green caterpillar was spotted by Peter Reimuller.

You can't miss this big caterpillar - it's lime-green! And it has little yellow and black antennas, and white spiky bumps, and lots of green feet.

Caterpillar of a Ceanothus Silkmoth by Peter Reimuller

At first I thought it was the caterpillar of a Hummingbird Moth but the markings were a little off. Then I thought of the huge Ceanothus Moth and...bingo!...I had the answer. This is the caterpillar of that beautiful moth.

Here is what this caterpillar becomes, photographed by Clay Yale. What a transformation!

Ceanothus Moth by Clay Yale (Medium)

Thanks to Peter and Clay for allowing me to share their photos with you here.