More back-of-the-envelope science

A reader writes: (to protect his anonymity, we shall call him Louis Bevier)

Loved the scribbles on your blog. Found mine and thought you'd get a laugh seeing them.
"LB"

So with permission, in the spirit of universal synchronicity of back-of-the-envelope IBWO debunking, here's a classic back of an envelope with woodpecker wingbeat calculations.

The image has been edited slightly, apparently to remove Kylie Minogue's phone number, though I'm not sure I can believe that bit.

Without baiting anyone, I invite other Ivorybill researchers to submit their genuine back-of-an-envelope writings, musings or, if appropriate, sloppy procedural errors, for publication here. Anything is allowed and remember, it's only libel if it's not true.