American redstarts offer challenges for birdwatchers and photographers. They flit about from branch to branch as they look for food. Sometimes, they catch insects in midair.
Redstarts feed on various insects. When they catch a moth or caterpillar, they rap it on a branch before gulping it down.
I remember attempting to photography my first American redstart about five years ago. It hopped about my feet, looking for food as I followed it through the woods. I was lucky to get a couple of blurry but usable photos.