Crows really are the Chuck Norris of the garden bird world. Hard as nails and completely fearless. Just the other day we witnessed one taking on a kestrel in mid-air. The ariel dogfight went on for at least 45 minutes before the kestrel gave up and flew off. This video shows just how mettlesome they really are as two circle and taunt a pair of cats who are about to get into it with one another. Our streets may be dangerous but our gardens are war zones.