Our Manx is a tailless cat only having a little bobbed nub to offer next to no balance or support, so sometimes, unless she has something to snag with her claws, she just doesnt have the balance to pull off the simplest of cat behaviours... even with a tote for extra height!! Fortunately she has many places in here in which to do so but not the window. She spotted a young squirrel in the tree and wanted a closer look but just couldnt make the leap... poor girl.