Looks like a Great-crested Flycatcher. They nest from the Rockies to the Atlantic. Don't know why it would be at a feeder...looking for bugs(?) These birds neither walk nor hop-only fly from place to place. Usually seen high up in trees.

Pretty sure it's a great-crested flycatcher, fagopher. Its actions seem a bit unusual, though. For one thing, they don't use birdfeeders, being insectivorous and catching their prey as it flies by. And I've never seen one look in a window (like a cardinal or wren might), either. But he looks rather like a young bird, perhaps newly fledged and not sure where to sit to watch for flying moths and the like.

Here are a couple of photos for you for comparison:

Marcia

Well it was rather curious.. I have 2 cockatiels inside my house next the to the window... on that day they were actually in the window (I let them free inside so they can stretch a bit) and I believe this bird was actually watching my cockatiels for a while...

That makes sense. It looks like a young and curious bird, or perhaps the cockatiels' calls sounded like a rival flycatcher. That would be my guess. In which case, it would definitely have to check out the competition.

Great-cresteds are one of my favorite birds. In central Florida, they are only here during the summer, and I'm always so happy to see (or hear) them arrive. I call them "Threeps" because of their loud call. You can watch them feeding...they perch on a branch or wire and wait for insects to fly by, then they swoop out and grab the bugs out of midair, and return to the perch. They eat a LOT of insects, many of which can be pests.

GCF's will use nest boxes if the entrance hole is the right size and the boxes are placed to their satisfaction.

Very interesting birds.

Marcia

I have two pairs nesting nearby they hang out by the bird feeders due to the insects attracted by the decaying fallen seeds and compost. They become very curious when I garden, check out my slide show and you'll see more of my garden buddies including your bird.

Zoozue.. very nice pictures in your slide show...

Thanks, my problem is I have hundreds of wonderful pics, and no patients to upload them. I have collected pics of 67 bird species in my yard, a 1/2 dozen butterfly species, snakes, rabbits, possums, squirrels, insects, you name it I have photographed it including every plant, tree etc...

Zoozue, nice slides! Wish I had 67 bird species in this yard. I do pretty well for the area I'm in (very urban), but nothing like that.

Your bumpy brown unknown caterpillar is a polydamas swallowtail, I believe. Also called a goldrim swallowtail. He's on a pipevine, right? The pipevine swallowtail looks very similar but with a much darker, nearly black, body color. I need more pipevine here. I have one, but it shot up to the top of a neighbor's tree and I can't see it any more. The polydamas butterflies flit through my yard, but I don't get to watch their cats, like I do the monarchs and gulf frits.

Marcia