These are divided baby feeder plates made by Nuby. I searched and searched for some sort of divided bowl or plate so that the wets don't get mixed with the drys. These are large enough to do the trick for a colony cage yet still fit into most cage doors. I measure 7" across. The whole cage can come sit around the plate and feed together.
They come with a lid which allows you to prepare a few days in advance and/or freeze to make it easy for serving time. Great for vacations! Walmart carries them in the baby feeding section for .99 so go get a bunch! I think you will find them very useful.
You can
browse my feeding photos
and see how I use them. Typically blend in one section, fruits in another and then veggies and meats in the larger section. They are very easy to clean. One plate per cage is all I use.