http://www.thisislondon.co.uk/news/article-23365034-details/Meet+Grumpy+-+the+nastiest+cat+on+earth/article.do
But it is not mice, birds or any other small animals he is after. It is not even the other pet cats he has already savaged in his neighbourhood.
They were deemed too 'small' a target to terrify, so he decided to turn his attention to a much larger prey - humans.