The bunny ears will now stand up on their own! The power of yarn wins through again. It was annoyingly fiddly, but basically just required changing the size of the ears so that they were less long and using a doubled piece of yarn on the sides of the ears, so that they were stronger, but not too heavy. It will all be explained in the pattern, eventually.
Meanwhile, my son has discovered that Round Rabbit is very ball-like. And therefore excellent for throwing.
I managed to get this photo of Rabbit in mid air, looking a little startled.