Thanks for the comments. I should mention that if you click on the third photo, then click the magnifying-glass icon at the top (“all sizes”), you can a better idea of just how many colors are in its coat. (Yes, I hit “contrast” in Photoshop, but just a little.)

Joan – I’m still working on a good possum shot (my mother could’ve used an extra illustration for her latest column). The trouble there is that possums tend not to be out when the light is good.

David – According to the Wikipedia article on woodchucks, they actually have two distinct layers of fur: “Suited to their temperate habitat, groundhogs are covered with two coats of fur: a dense grey undercoat and a longer coat of banded guard hairs that gives the groundhog its distinctive ‘frosted’ appearance.” I guess I’d quibble with the “grey” part.