As I became interested in the wildlife in my garden, I started feeding the birds, and then became interested in trying to photograph them.   I'm quite short-sighted so find it difficult to see a bird in detail: but once I've got a photo and can enlarge it on the computer screen, I've been able to learn to identify different birds.  From being an ex-townie who could only identify pigeons, seagulls and robins, I can now recognise all our garden birds!