Hummingbird approaches the feeder carefully

I watched the feeder this morning and saw a hummingbird approach several times only to be chased away by a bee. I took this shot as he approached carefully and watched for the bee to leave. I was quite close to the bird as I was using my 18-50 macro lens. Later I watched for quite a while as one bird guarded the feeder and chased away any other birds that approached.