Nice pics Milligan. I love birds and now I live out in the sticks we get loads. We also have two cats and they have just reached hunting age. I hoped they would grow up not being interested in birds but sadly not to be. Just seperated one of them from an already injured baby sparrow which then got upstairs into the study and took about ten minutes to catch. Managed to get it in some Tupperware and release out the front. Really quite traumatic for me but about 1000 times more for the poor little sparrow
I was looking at estimates of the number of birds killed by cats each year and I came across this, which I thing is interesting.
Originally Posted by Ragtime View Post
In the recent Birds Britannica show (week 1) the presenter said that cats are responsible for killing 50 million birds a year. I think I have remembered that correctly, yet even a casual flick through the RSPB guide totalling up the number of garden/woodland birds in Britain makes this almost impossible to believe.
Did I mishear? If not surely that number is incorrect? After all we have a dozen other reasons for birds dying as well to add to this number.
Any thoughts?Without getting into the pros and cons of keeping cats, you may be surprised at the number of birds that do die each year (all reasons, not just cats).
Generally, for most passerines only 2 birds per pair are expected to survive until the next breeding season, so if we look at a few figures:
Blackbird: 4 million pairs, each producing two broods of three = 24 million that don't survive until the next year.
Blue Tit: 3 million pairs, each producing a brood of six = 18 million that die.
Chaffinch: 5 million pairs, each producing a brood of three = 15 million lost
Robin: 5 million pairs, each producing two broods of three = 15 million dead.
So, despite the fact that I have only looked at four common species (and I have deliberated reduced the estimated breeding population, the number per brood, and (to some extent) the number of broods, we are already at 72 Million! (and for these four species it's probably really nearly double that)
If I continued to total up the number of young produced by all of the UK's bird species that might be taken by cats, 50 million would end up as a fairly small percentage.
If you also look at the number of cats in UK ownership (estimated at 10 million, based on government figures), then for 50 million to be killed by cats they only have to take 5 birds a year on average - easily below a believable level, even if you take into account the fact that many will kill none.
So no, you probably didn't mis-hear. It is easily possible (and if there were no other threats to birds it would probably be easily sustainable - especially as the numbers of natural predators in many parts of Britain are still below natural levels because humans killed most of them).
Surveys have confirmed the figures of around 50 million birds killed, eg. this one (and even the cat protection league apparently give the same figure).