This one is a 4-Tier Cage:
1. The Wire Cages: 4 levels up. Each level has many small compartments for laying hens.
2. The Red Things: Those are the Nipple Drinkers. Birds peck them to drink water. The white pipe on top supplies water to them.
3. The Long White Troughs: Those are Feeding Troughs. You pour layer feed there.
4. The Black Flat Trays: Those are Manure / Dropping Trays. The droppings fall on them, so it doesn't fall on the birds below. You pull them out and clean them.
5. The White Box at the Back Top: The Water Tank. It sends water down through the pipes.
6. The Slanted Wire Floor: When a hen lays, the egg rolls forward to the front where you pick it.
7. It comes together with the trays