Strangers to the countryside

The Clancy twins decided to go camping for the weekend although neither had been out of the city in their lives and both were totally ignorant of the ways of the countryside. Seeking information they chatted to a farmer whose field they were about to rent.

'Could you tell us,' asked Mick, 'why that cow over there hasn't got any horns?'

'Well,' said the farmer, 'there are lots of reasons why cows don't have horns. They can be born with a crumpled horn and it has to be cut off for its own safety. It can be a specific type which has been bred to be hornless. But the real reason why that cow hasn't got any horns is because it's a horse!'