All these images currently say "less than 1 cm" which seems unlikely for a full-grown caterpillar, perhaps it's true for the first one. Please remove it from images to which it doesn't apply. As always, more accurate information would add value to this series. I see the last three images are all dated August 6 - did it change from white to yellow as well as forming its pupa on that day?

I like the shot where it shed its hair and revealed green skin - very interesting.

Moved from Butterflies and Moths.