How are their temperments? The black rats we hatched from eggs someone brought us were very very agressive. Also, i know that black rats do change color as they mature. The babies look similar to that but as adults they will be almost solid black, so they'll probably change as they mature. We have a few yellow rats I could post some pictures of if you're not very familiar with what they look like as adults. I hope the rest of them hatch for you and that they all eat.