This is nonfiction with simple explanations and excellent vocabulary. The artwork is gorgeous, and I loved the explanations for how animals and insects create nests, burrows, and homes. It starts with birds, then moves on to insects, then switches over to other creatures, everything from amphibians to mammals. They choose creatures from all different biomes to make it more interesting.
I loved this one, and I think my 6 year-old nephew would also love it. I actually learned a lot, and I even think my mom would love this, since she feeds the birds at her house. This would be great for use in science classes, lessons, and STEM storytimes. You could even break it down and read about one or two different creatures/homes per day, if you wanted to pull together a unit.