Well, I'll just toss my two birds into the blackbird pie...

I don't have a problem with the two birds metaphor...I hunt and fish (and eat what I take), but I really like the alternative "Go the extra mile with one step" that was proposed by someone. It's longer, but mixes several metaphors in a thought provoking manner.

Incidentally, I read the other day that the human population is now consuming our natural resources at a rate of 1.2 years-worth per year. That is, it will take 1.2 years for the earth to regenerate what we use every 1 year. I suspect that the human population would profit from a little predation - though the preyees wouldn't appreciate it much!

Robert