It is a really quality work: very thorough and well-written, illustrated with lots of full-color photographs.  This is a series I have been generally very impressed with, and I would probably recommend it for middle school or high school, but I hesitate because this is not my area of expertise.  As an elementary librarian, I am happy to put it on my shelf, and it may find some limited interest (particularly if I make a point of pulling up the video feed to the webcam that watches the nests).  The photos would draw some students in, and the text is broken up sufficiently into assorted captions and sidebars so that younger readers may browse through the photos, reading bits and pieces, but I doubt elementary students would read the whole thing, as it’s a bit text dense.