We are Catholic Charlotte Mason home schoolers and have been reading "The Burgess Bird Book for Children" by Thorton W. Burgess.
"While 'Interviewing' saucy Jenny Wren, as well as Redwing the Blackbird, Melody the Wood Thrush, Spooky the Screech Owl, and dozens of other common birds, Peter Rabbit --and readers-- learn about the birds' physical appearance, behavior, eating and nesting habits, songs and calls." (excerpt from the back cover)
Here are some of the birds that Noah has studied. According to Charlotte Mason, narraration is a very important element when learning. For this particular study, Noah has been using drawing as a form of narraration. His pictures include a brief description of the birds studied and a few points of importance about habitat, nesting, food sources and character.