Paul Simon turns on lamb

The field next to our house is littered with some adorable, soft, cuddly lambs. Most of them are scared of every noise or movement they detect. Anything sends them rushing back to the security of the mother vessel. Wooly Legged Jumper however is the odd one out. If I whistle Fifty Ways To Leave Your Lover it comes nearer. If I whistle another tune it doesn't respond or react in any way. How very strange and compelling. I'd like to know why, but I feel such an idiot if someone walks by and sees me whistling at sheep. They avoid making eye contact when passing me. So I scare people. Good...