It is my belief that these cats are labouring under the misaprehension that they're birds. Observe their behaviour. Take for a start the cats' tendency to hop about the field on their back legs. Now witness their attempts to fly from tree to tree. Notice they do not so much fly as plummet...
Thank you - you managed to stop the very disturbing ear-worm and it's even more disturbing associations.
He's that most dangerous of creatures, a clever cat.