Those are common places for people. My boyfriend's feet are suuuper ticklish and it's so cute when I try to tickle his feet :3 He immediately retracts.
Yeah I noticed that when I was younger. I thought it was the coolest thing whenever I saw the feathers and I would always point it out lol.
Yes.. my belly is very ticklish O_O Actually, my very lower back is one of the most ticklish spots for me xD Around where those two dimples are but just a tad bit lower.