Bought this to go with my Vertebrates module at university (I'm studying zoology) and it has been useful as the lecturers used it as the main source for their slides. However I found it quite difficult to read, the pages are extremly thin and disgrams have no color (which i think does make a difference!). I haven't used it as much as I thought I would but saying that I will no doubt come to it again in the future. The major downfall for me was the price, if it cost say £15 less I would have been a lot happier, but I have bought more informative textbooks twice the size for less. One other book I would recommend if you also study Ecology is Ecology from Individuals to Ecosytems (Michael Begon, Colin R Townsend and John L Harper), I have found it extremly helpful for my Ecology module. :)