A recent UFO sighting video has gone viral due to the strange shape of the flying object, which almost makes it seem to have legs as it hovers in the air.

Captured by YouTuber ETNWO aka Bap, it seems this is not the first time a UFO sighting like this has been seen in Ireland.

"I filmed this strange entity slowly moving west, behind the Cavehill in Belfast," writes Bap.

"The thing looked like it had legs at one point, then just at the end you will see it seems to double up the image, which seems to be common with the inter-dimensional things I've filmed in the past, the orbs and probes have doubled up a lot of times when filming."

The UFO sighting video appears to be a hobby for Bap, and he or she firmly believes the entity to be extraterrestrial.

"This entity seems to have two orbs within it, you will see the strange behavior of it, sorry for the shaky footage, but when you see something like this in the sky, you grab the cam and start shooting...as I did...and lucky enough after I got the camera steadied up a bit, I zoom in on a swift flying 'small fast bird', which I thought was the 'thing', then I pan over to the right to where the entity is, it was good to get the bird in the same footage, as it gives a perspective of what I'm capable of filming."

Despite his or her firm beliefs, however, some have offered other explanations of the UFO sighting video.

"I think it's a mylar dragon balloon. It's clearly spinning on its own axis, not changing shape. You can see it's reflecting the sun, off whatever side lines up at the right angle to allow reflection," writes kickinbackinOC.

"Also, the intensity of the reflection is in keeping with mylar balloons. (I am a UFO believer, and have seen three). Maybe it's a UFO, but I don't think so. Sorry to rain on anyone's parade."