[xoxoxoBruce]

I do not approve of killing the birds. No how. No way.
That said, I don't believe the flora and fauna of the earth was left to my stewardship, or yours. That's a religious thing.
Humans are just another critter left to his only devices to survive in a very hostile world. We were better equipt and have evolved to where if we really put out mind to it, could control everything, maybe even the weather to some degree. But that gives us neither the obligation nor right to do so.
Sure, it would be smart to take a que from other critters not to be screwing everything up around us. Those birds might dine on a bug that could wipe us out. There's too much we don't know.