My kids love animals, so they really enjoy Ranger Rick. Its put out by the National Wildlife Federation. Great pictures, games, ect... They also have another magazine called My Big Backyard for younger children.
Here is a link to see or buy the magazine if interested
My kids love Disney Adventures and Zoo Books. DS has gotten Boy's Life since he was 7, and really enjoys it (I think anyone can get it, not just Cub/Boy Scouts).
I can remember getting Ranger Rick as a kid, and I loved it!