You know, that is the exact same thing I can say for my squirrel tail grey. At 11 weeks, when we brought him home, he was a maniac. He ran and ran and wouldn't stop. He wouldn't let anyone catch him. He just played with anything he saw. We thought it was because he was in a cage at the shelter. Even our other new kitty didn't know what to make of it. He now loves to climb trees.