The other morning I saw a bank swallow chasing what appeared to be a butterfly. Despite their bright colors, I have never seen a butterfly get "picked off" by a bird. Dragonflies, yes; butterflies, no. So, it got my curiosity up immediately and I glassed it (in other words, I was only going to watch through the camera, using the telephoto as a monocular).
It turned out to be a feather that the swallow was trying to capture, maybe to use in feathering it's nest. The only reason I was able to take images of it (since they are normally way too fast and erratic in flight to keep up with them through the camera) is because the feather caused the bird to slow down to try to catch it.
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