Chicken vomiting and abnormal poop! (warning: poop pics)

[FelixFelicis]

Hi, I was just sat watching my hens and I noticed that one of my welsummers, Professor Umbridge, was pecking at a patch of liquid on the floor. at the time I assumed it was just spilled water, as I had just changed their water. However, a few minutes later I saw her regurgitate on to the floor, and then eat it up again. I shooed her away so I could take a look at whatever she had thrown up but she'd mixed it up in the dirt so I couldn't really be sure of what I was looking at. I think it was mainly water, but had a consistency closer to human saliva. I'm not entirely sure whether or not it had anything else in it because it was all mixed up in the dirt.

She seems otherwise well, bright-eyed and bushy tailed (although she does have scaly legs atm which I last treated a few days ago if that's of any importance). Is this normal behavior? Or should I be worried?

I've also noticed a couple of odd looking poos over the last week or so. A few times I have seen this yellow foamy poo (it's actually a brighter yellow-ish than the picture shows). I've only ever seen this in the run and not in the coop:



And one morning I found this under the roost, it appears to have bloody mucus in it:





I'm new to chicken keeping so I really have no idea whether this is normal or not!

Thanks from me and the flock for the advice!

 

[FelixFelicis]

Forgot to add! My blue orpington Roo has a mucky bum! It has been that way since I got him a couple of weeks ago, for the first few days he slept in the nest boxes so I assumed that he had done the same at his old place and that's what was causing it, but after seeing the foamy poo I'm now thinking maybe it's worms? It's not as bad as it was when I first got him, but it's still not a pretty sight. He's also otherwise well with no other symptoms that I've noticed. Should I clean his bottom somehow?