I am going to say something unpopular. I don't like teaching about biomes I think they are boring. I have tried all kind of things to try to make this better for the kids and less torturous for me.
This year I provided an old PowerPoint with all pertinent information, I put two copies per 8 kids on long tables. The kids made flipbooks from the powerpoints. It was a nice change of pace. They got to socialize a bit while they worked. They were all working so well, they didn't even notice I was taking pictures.