Can birds ever be used as the power source for a flying machine?

Yes. It has been done before.

If u strap a gopro camera on one you technically got a flying machine powered by bird.

No one said it has to be heavy.

You flyboys crack me up!

Of course they can. Haven t you seen Chicken Run? It s a factual documentary about chickens building a functional aircraft.

If sufficient numbers were ground up and heated so that the fats could be pressed out of them and turned into synthetic fuel the answer is probably yes.

Probably not European sparrows, but African sparrows are a different story. https://www.youtube.com/watch?v=liIlW-ovx0Y

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Only in the flying machines called "birds".

This question has nothing to do with the Peking Boulevard.

Perhaps your question should make reference to Peking Ducks.

Most birds can't carry much weight.

It would have to be dead with batteries inside it