The many uses of bunny ears.

We've learned from watching Simon and River that bunny ears can be used for more than just hearing.  Here, we have Simon using them to slow his rate of descent from a binky.

River is using her ears as a parachute in this pic.

They're used for balance while turning at a high rate of speed.

And last, but not least, bunny ears can be used as a built-in collision avoidance device.