Aphid eaters

The sudden departure of the aphid colonies from my peppers seemed a little too... sudden. I was having a good look at some of the plants tonight and noticed a few tiny worm like creatures slinking around on the leaves. I believe they are hoverfly larvae. I haven't seen any of them eating any aphids because there are no aphids left to eat. These larvae move around like an inch worm and do so very quickly. And as they move they constantly "feel around" for something to eat. I've seen hoverfly larvae before but not quite like these ones. I wish there had been some aphids around for them to eat. It's fun to watch.