Rescued 4 chicks- questions

[Koggecritters]

We already have 8 6 week olds and 6 2 week olds, but I couldn't say no when a friend of a friend bought 4 for her apartment, raised them for a few weeks, then tried to dump them on anyone who would take them. From what I gather they are 3-4 weeks old, unknown breed. They look dirty, greasy. I know they are molting, but mine have never looked like this. Recommendations appreciated. Also, if anyone knows what local tractor supply breed they may be, I'm curious. I have gotten them into an appropriate brooder with heat and they are perking up.

 

[Koggecritters]

Here are our 2 week old Easter eggers just because .

 

[Koggecritters]

After calling the store I have determined that they have to be ISA browns. I'm so excited!! They are super thin and look greasy. Again any help on that would be appreciated. They were not started on medicated feed. I started it today.