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DENVER — It’s a story that’s captured worldwide attention. UFOs caught on camera that appear to be launching and landing in the Denver metro area.

An aviation expert could not identify it but we’ve heard from hundreds of viewers who think they can.

So we talked to more experts, and asked an entomologist to analyze the video, but the answer is still anything but clear.

We first told you about the strange sightings in the mile high skies, after a Denver man, who does not want to be identified, brought us his home video.

The flying objects are too fast to see with the naked eye, but when we slowed down his footage frame by frame, we saw something there.

Aviation expert Steve Cowell could not identify it. “That is not an airplane, that is not a helicopter, those are not birds … I can’t identify it,” he said.

The images were captured on camera from a hilltop in Federal Heights, looking south toward downtown Denver.

That location just off of 84th Ave. and Federal Blvd. has now become a popular place for UFO sightseers, “I wanted to come out and get some footage for myself,” Jon Gardner of Broomfield told us.

And we have been inundated with phone calls and emails from across the country and as far away as Greece, Croatia, Japan and Korea.

Many people have sent us pictures of similar looking objects.

Others believe they have “solved our mystery.”

The top 3 answers we have received are: remote controlled aircraft, military drones or insects.

A remote controlled aircraft seems like a possible explanation, but the man who shot the video has spent several days in the area near 56th Ave.  and Clay St. where the UFOs appear to be launching and landing.

He hasn’t seen anyone flying a remote controlled toy, nor have any of the neighbors.

Aviation expert Steve Cowell also suspected we had captured military drones until he watched the video, “I don’t think it’s a drone,” he said. He has never seen an unmanned aircraft that flies so erratically.

In order to fly drones, the FAA must issue a certificate of authorization. The FAA has issued hundreds of COAs to the University of Colorado to fly drones north of Boulder, but it says no drones are authorized to fly over the Denver metro area.

But by far the most popular theory is bugs. Many of you wrote to tell us the object in our video is most likely a fly.

We showed the footage to entomologist, or insect expert, Mart Ann Hamilton. “This is a toughie. I’ve never seen anything like this,” she said.

Hamilton watched the video over and over again, then she gave us her professional opinion. “After watching the various shots, I do not believe it’s an insect. The shape is inconsistent with an insect,” she said.

But that won’t convince skeptics, like Bret Dallas. “The UFOs aren’t UFOs anymore, we’ve identified them as insects,” he said.

What do you think these UFOs are? Join the conversation on our Facebook page.

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Want to see more UFO reports? National UFO Reporting Center