Update 1: After I emailed Zimmer a link to this blog this morning, he sent me this reply (posted here with his permission):
Hi Tom, I enjoyed the postings on your blog. I'm well aware there are any ivory-bill skeptics, and there should be until a bird is actually in hand and positively identified. eWhen I do advances like this, however, I need to take Gallagher's story at face value, because the event isn't really a debate. Actually I did a column a few months ago on the economic benefit of having a nearby once-thought-to-be-extinct species, and how it will remain alive and well if there's money to be made. Check it out at [this link]. I'll check out your blog regularly, and link it to mine.Update 2: Here is a related new blog entry from Zimmer.
Thanks for reading