I think that the leucistic song sparrow that I saw last year has had an offspring with similar traits. Here is a link to the photo: ?https://www.flickr.com/photos/11815777 at N07/35747787516/in/dateposted/
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?If you read in the comments section under the photo, the first comment is a link to a photo of the original bird. ?You have to click on the pic to make it larger.
Michelle MaaniSalmon CreekVancouver, Washington