The snake in the photo is the one discussed in Werler and Dixon's 2000 Texas Snakes book. It was 63.5 inches long, if I remember correctly (don't have the book here).

There have been a lot of anecdotal reports of bairdii in excess of 5 feet but I don't think any larger specimens have actually made it into collections. I have seen quite a few bairdii and never seen one as big as the one in that photo I posted.
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Chris Harrison
San Antonio, Texas