And now that I think about it, do metal chickens even need to breathe? Oxygen is needed for all sorts of organic reasons, but metal isn't organic and is probably good with basic circuitry. I do hope he is waterproof, though. (I assume he wouldn't go in, with or without a raft, if he wasn't.)
And on that note, how difficult is it to cook him, and who really enjoys eating a bunch of metal and wiring???
I kinda do admire this bit of evolution, actually.