Mine wear them, and no the bells don't make a difference to how many presents they bring! Stupid birds! lol
Both cats have lost a collar since we moved here, Milo had a lovely black collar with an elastic bit and came home oneday without it, a lady brought it round saying it was in her vegetable path and thankyou to milo for scaring off the blackbird after her rasps! He had got caught and snapped the elastic.
Maisy got her quick snap collar caught on a bit of chicken wire.

I check their collars regularly, if Maisy's quick snap one is getting a bit still I get her a new one. Milo's replacement collar is just a cheap one from the pet shop and you just need to look at it and it will fall off.

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