birds and cats

planted some baby leeks out earlier this week with cloche hoops and sticks to protect them from the birds. early this morning I saw a pigeon heading for the leek patch so,having shooed it away, I strung some foil bottle tops together to make a bird scarer. when I went out to hang it up, I discovered that a big chunk of the patch had been dug up by the CAT. you would think he would keep the birds away.instead he just causes more trouble!