Our outdoor cats are great leapers. My bird feeder is over my head (I'm 6'3") and I've seen the cats leap up and snag a bird feeding at it. Most of the birds they catch are eating seeds that have fallen to the ground though. I guess that wouldn't be an issue with hummers.
Mark - Randomography
"The $0.99 menu was put on this Earth for a good damn reason." -Weebl