Please use this title as a pickup line.

My god. Lol I had not noticed what community this was and out of context I was like , excuse me?

wow. reading the title perusing all I thought this was something else entirely.

I'm a little unsure what a brooder is (non native English), but:

Edit: Looked up a brooder.

They live on the ground. Isn't their enclosure floor already dirt? "Garden dirt" is just dirt from another area, no?

Putting dirt in the brooder seems a little extra. Should be just fine with hay or sawdust or whatever you use at the moment. They might enjoy the mirror though!

Chickens are metal as fuck and not as dumb as people think.

Ontop of that they eat their young sometimes, they peck rats and mice to death and eat them, they eat bugs and frogs...

There's not very much from "nature" you could give them (within reason) that'd be harmful to them.

The broom handle perch is a nice thing to give them and you absolutely do not need to "clean" a branch from nature before giving it to them.

I'd also like to see the chickens, please.

I dunno about in the brooder, but chickens in general like music. There was some research done into it that I read when we first got birds, and it has held true so far.

Mine tend to favor smooth jazz, bluegrass, throat singing, and classical.

When I raused young chicks (in a big cage, not a brooder), I just put an old towel on the floor and had a stick to sit on for them. And of course a heat plate, but I guess you don't need that in a brooder.