Rebutia albipilosa

The hummingbirds are really active right now. I was holding this up to take a picture of it and I almost swatted at a bug buzzing at my ear. Luckily I took my eyes off the view screen on the camera long enough to see that the "bug" was actually a hummingbird, about 2 feet in front of me, taking aim at the flowers. However, when it became aware that I was watching it, it flew away and gave its attention to some other flowers on the deck.

The plant I was trying to take a picture of was this: Rebutia albiflora. Enough said.