1) American goldfinch 2) Dendroica petechia 3) Golden warbler 4) Mills Brothers hit 5) New world warbler 6) Wood warbler 7) Yellow warbler Found on https://www.crosswordclues.com/clue/yellowbird
• (n.) The common yellow warbler; -- called also summer yellowbird. See Illust. of Yellow warbler, under Yellow, a. • (n.) The American goldfinch, or thistle bird. See Goldfinch. Found on http://thinkexist.com/dictionary/meaning/yellowbird/
Yel'low·bird` noun (Zoology) (a) The American goldfinch, or thistle bird. See Goldfinch . (b) The common yellow warbler; -- called also summer yellowbird . See Illust. of Yellow warbler , under Yellow , adjective Found on http://www.encyclo.co.uk/webster/Y/4