They have recently arrived in my street. We had beautiful...

They have recently arrived in my street. We had beautiful blackbirds in the garden (not native I know.. but beautiful song every morning and evening, a real pleasure, and one of the reasons we decided to extend rather than move..)... I have seen three of them hold down and murder one of their own, and attack the blackbirds. The blackbirds have gone and now the garden is silent... it is terrible. Does anyone have a link for where I can get a trap. I hate them....