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Hi Shelley,
As Chris and Geoff have already hinted at, when you purchase a dslr camera you are buying into a system which requires an assortment of lenses to give you the flexibility you need. It's not like a hybrid bridge camera where you're stuck with the one lens to do everything with.
So you need to cover a focal range from around 10-14mm at the wide end to say 200-500mm at the telephoto end, but you'll need a minimum of three to four lenses to cover this range and get the quality you're looking for. As has been suggested the 17-55mm f/2.8 would be the best direct replacement for your current kit lens, though for landscapes the Sigma 10-20mm f/4 would be better. Your existing 100mm macro lens is superb for portraits as well as for close-ups, which would leave just a telephoto lens for your other wildlife shots, say the Canon EF 70-200mm f/4.
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