Should cats be cooped up at night to spare other wildlife?
20 June 2012 Last updated at 16:39 BST
Springwatch presenter Chris Packham has told BBC Radio 5 live that cats have become the enemy of other wildlife.
He told Richard Bacon that pet owners should impose curfews on their cats at night and fit their collars with bells to warn birds that they are close. But vet Emma Milne said it would not make a difference.
Mr Packham said cats were responsible for the death of 50 million birds every year.
To find out more about 5 live stories, please visit the Best Bits page.