Possibly a White Marked Tussock Moth Caterpillar (Orgyia leucostigma), or a similar Tussock Moth variety. Approximate 1:1 magnification (life-size). I observed four color variation of the same fuzzy caterpillar.
Photographed at Rancho Santa Ana Botanic Garden, Claremont CA.
Hand-held Nikon D90 at ISO 400, with Nikkor 105G macro lens, 1/100-sec at f/29; full shade & Nikon SB-600 speedlight with O-Flash 3/4-circle Fresnel prism diffuser.
Some beautiful work from both of yooos guys right here! I think Douglass' caterpillar spent a little more time in "make-up" before the curtain went up. :thumbup: :thumbup: