But Thumper was different from his brothers and sisters. Thumper's lip and nose looked different. His face looked somehow, not quite finished. The skin on his lip didn't come together like it did for the other bunnies in the litter. Thumper's lip was cleft.

Momma Bunny looked Thumper over and thought, "Hmmm, This one will likely be weaker. Too bad. He really is pretty. Well, I must look after the strongest of my babies. Too bad about this one."
(Animals are like that, but people are not, you know.)