Cats are by nature a bundle of rubber bands with the attention span of a gnat. They're quick but they tire easily.
If you want your cat to stop chasing birds, feed it well and play with it lots, but not fluttering things going up and down like fake birds.........trail a string, roll a marble, use a laser pointer, to get it to chase around. Even adult cats are really emotionally stuck in the kitten stage apparantly, so they do adapt, and they're selfish little furballs so their comfort matters but all toys are theirs
If toys are running things instead of flying ones, peace all round
Love mine dearly
pain in the neck at 4.30 in the morning when she wants out though
and no, she doesn't wear a collar either.
Earring bells on cats are an old idea, might stop them hearing the cheeping from the nests that attracts them though............don't know how the vet would take fitting them
I do know that their ears are really sensitive however.
I too reckon the grey squirrels have a lot to answer for in the numbers of small birds nests that get predated. They take squabs too; the blackbirds now divebomb the blighters around here.
cheers,
Toddy