I have 4 chicks, 2 are almost 3 weeks old and the other 2 are almost 2 weeks old. They all seem to shake when I hold them. (though, it's hard to tell if they shake normally or not) Now, I know they aren't scared of me as they feel safe enough to fall asleep in my hands. They aren't cold either as they have a nice warm light and they run around everywhere in their chicken box pen. (spoilt rotten chickens ) I have a temperature Gauge in the box and it is between 28-33 degrees C. I only have the light on at night as it is starting to get cold where I live. (had to get a stronger light) So, is this normal or what?