It is a furry mouse, filled with catnip and has feathers attached near the tail.
It was an instant success. He managed to knock over the clothes airer in the process of "killing" this mouse.
He throws it up in the air and pounces on it. Within twelve hours, it had lost one of it's feathers. This morning, he was sat under the table growling at D's foot to make sure no one was going to take away his toy.