While birding along the Salmon River on Hwy 75 between Challis and Bayhorse (Custer County), I came across a very pale Gray Catbird juvenile today. I managed to get a couple of photos through layers of vegetation and posted them on my eBird checklist. (http://ebird.org/ebird/view/checklist/S38786956) Looking through photos online of darker juvenile Gray Catbirds makes me wonder if this individual might be leucistic. 
I wanted to also note that the birds really like the white berries on the Red Osier Dogwood. Both along the river today and up at Bayhorse yesterday, the bushes were hotbeds of activity with foraging Warbling Vireos and Western Tanagers. Chipmunks also seem partial to the berries, providing some nice photo ops.
Happy Birding,
Wendy McCradyChallis, ID