Gray Catbird (Dumetella carolinensis) 2016-6-1 Newark, DE
2017-10-28 update:
Catbirds that eat Northern Spicebush berries are fat and healthy birds, according to:
https://americanornithologypubsblog.org/2017/10/23/author-blog-migrating-birds-that-eat-northern-spicebush-berries-are-fat-and-healthy-birds/