Hybrid Yellow-rumped Warbler

This is the only quick shot I managed to get of this little bird and I only took it because I thought it might be a Yellow-rumped Warbler, but I wanted to check. When I was asked if it was an eastern Myrtle Warbler (ssp coronata), or its western counterpart, Audubon's Warbler (ssp group auduboni), I said that the throat was white with a patch of yellow. In other words, it's a hybrid of the two. I don't really know anything about these birds, so I'm not even sure if this is a female or male. If anyone knows, I would really appreciate any info - thanks! Taken when seven of us spent the day two days ago, 28 June 2013, at Bow Valley Provincial Park, recording all species of flora and fauna that were seen.

ID from flickr member, birder74: "Looks like an inter-grade 'Audubon' X 'Myrtle' Yellow-rumped Warbler female". Thank you!

en.wikipedia.org/wiki/Yellow-rumped_Warbler

www.allaboutbirds.org/guide/yellow-rumped_warbler/id

www.flickr.com/photos/annkelliott/9176172624