My pekin is 3 weeks old and has started this chattering motion, and a little shaking allover it's body. No diet changes in 2 weeks. The chattering motions seem to be getting a tad worse tonight. My rouen (3 weeks old) is perfectly fine. The pekin is eating and drinking normally also. They had a bath earlier and it was diving, playing and acted completely normal. Can anyone please give me any advice on what may be going on. They both eat manna pro non-medicated with brewers yeast added, a few treats here and there. Thanks!