When I was in Ohio last spring, I picked up a really terrific warbler 72 page color guide published by the Ohio Wildlife Agency. To keep my comments brief , click on the link to see for yourself. The first warbler species will show up the end of this month ( but not roaring in like a lion). Pine and Palm warblers are the early ones. Check out the great guide ( which will be also easily accessed on my blog's side menu "warblers id guidebook") and get ready in learning the warblers.
--Kingsboider
http://www.dnr.state.oh.us/Portals/9/pdf/pub349.pdf
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