Pacific Banana Slug feeding on a giant white russula mushroom
The Alaskan banana slugs come in a variety of colors, including almost pure white.
This Ariolimax columbianus or Pacific Banana Slug shows the leopard coloration. Lately I've seen one white, and many brown and black banana slugs. Today near Anderson Lake there were hundreds, mostly climbing around on mowed grass and in the forest. This one was about 3" long and crawling on a Sword Fern under a conifer forest.
Ariolimax columbianus (banana slug). we see one of these every few days on our shaded front walk.
Trinity County, California, US