Problem is the bird shooting is not satisfying with a short lens, and a dSLR lens long enough is not lightweight; you are probably looking at a 70-300 mm lens to get reasonable reach for the birds. An alternative is Superzoom cameras, I think the current Canon one is called SX30. That has the problem of not being the best if lights gets low, but in good light you will be surprised by the quality such cameras can provide.
You will need to explore this a little further, figuring out if the weight of the dSLR is worth it.
There are intermediate choices as well: for example micro-four/thirds (olympus or panasonic) with smaller lenses providing a lot of reach. One more thing to look into for you.
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