DD7 loves the Wildlife Explorer program from IMP. It's not a magazine, but when you sign up they send you a binder and a pack of pages to put in the binder.
Each month you get a new pack of pages to organize into different categories in your binder.
Ex: mammals, invertebrates, birds, ect. and more categories, I don't have it in front of me now. She really likes it, though, and each card has tons of facts for each animal.
I think you can google wildlife explorer or add IMP to the search to find the website.