Deletion of Battle of the Birds

Comment: What |reliable sources have documented this rivalry.  There's a lot of books written about baseball.  I was unable to find a single one that even mentioned this rivalry
Stance: comment
Cited policy: Wikipedia:Reliable sources (WP:RS)

Comment: as .  Although the term is often used when the mentioned teams play each other or are otherwise compared (see http://espn.go.com/sportsnation/post/_/id/9279456/lcs-round, http://espn.go.com/sportsnation/post/_/id/9232494/which-team-mlb-best-uniforms, http://www.vancouversun.com/sports/baseball/Blue+Jays+dumped+Orioles+battle+birds+Baltimore/8654789/story.html) but there is no longstanding, notable rivalry as claimed by the article.  The term has also been used to describe games in Australian rules football (http://www.theroar.com.au/2013/09/01/crows-big-winners-in-battle-of-the-birds/) and rugby (http://www.nswrl.com.au/default.aspx?s=article-display&id=84660&title=chan-prepared-for-bitter-battle-of-the-birds
Stance: delete
Cited policy: Wikipedia:Wikipedia is not for things made up one day (WP:MADEUP)