Widespread ignorance among cat-owners about the sex lives of their pets may be leading to more than 200,000 unplanned litters - or more than 850,000 kittens every year in the UK, finds research published online in Veterinary Record.
In fact most litters of cats born in the UK are unplanned, the findings indicate.
It is thought that up to 150,000 cats in the UK ended up in animal welfare facilities in 2009-10, and that unplanned litters account for up to one in seven cats being given up for rehoming by an owner.