Someone's getting pudgy!

I noticed that the Hummingbirds that came to the Birdsy feeder just quickly checked things out and never sat down. It was as if they couldn’t figure out the feeder. I thought it might be because they are not used to the insect guards, so I have removed them now and try to keep the nectar level low so the wasps cannot reach in. This seems to have worked - this little guy sat right down for two minutes.