Fifteen years ago this month (in Feb. 1997), scientists in Scotland announced they had successfully cloned a sheep, Dolly. I remember it being big news at the time, and cloning is certainly still controversial 15 years later. While Dolly died in 2003, she is arguably the world's most famous sheep. To commemorate Dolly's legacy, here's a list of YA/MG books about cloning.
"I Think I'm A Clone Now" by "Weird Al" Yankovic