Help! Are my chickens sick?

[lchave07]

This morning I went out to water the chickens, and I noticed that at least one of them was wheezing. Later when my boyfriend went out, he had noticed that the three of them were curled up in a corner together in their run, instead of pecking around as normal. I had also noticed them huddling in the same spot yesterday, but just dismissed it as being cute.

I haven't noticed any other sick symptoms such as discharge from the eyes or nose. One of them pooped something akin to our pee, and I've never seen that before. Is that chicken diarrhea?

New chicken owner,
Larisa