What property of a camera reduces the motion blur?
Is it just the shutter speed?

For example, with my current camera I can take good pictures of some things in motion without the blur (cars on the highway, people running, etc).

But when it comes to REALLY fast things, I still get the blur.
Take a look at this picture I took:


The hummingbird's wings are still too fast and just end up being a blur.
I have seen other pictures where they were able to capture the wings with no blur at all and even show sharp detail on the wings.

It looks like I need something that gives a very short exposure?