text: Often , Sylvester and Junior 's shorts would feature Sylvester trying to capture Hippety Hopper , a baby kangaroo , to prove a point to his son .
simplified: Sylvester Junoir is useually seen with Sylvester in the cartoons when Sylvester is trying to catch a baby kangaroo named Hippety Hopper who he often mistakes for a mouse to prove a point to his son .