Falconer's article in current Cage and Aviary regarding raptors.
He has studied these creatures and this is what he has to say regarding numbers etc;
In a 8km (5 mile) circle he saw the number of sparrow hawks nests go from
5 to 22.
Each one being used.
He says that the minimum number of prey that a pair of hawks will need to feed their young is 1,200 prey items, this does not include all those lost that die in the nests when their parents have been eaten alive nor the eggs that will not be hatched, this 0ver a period of 80 days.
And as he says that is a conservative estimate the loss of other species will be more like 1,500 not including the other days of the year that both the parents and the young will have to feed.
So the loss of other species in that small area would be 33,000 in a year.
Is there any wonder we have a problem?.
Regards.