Nick Pope, who worked as a Government advisor and investigated UFOs for the MoD, urged people to be distrustful of the greedy gulls.
He said that besides stealing chips and ice creams, they could pose a more serious threat by collecting evidence for an advanced alien race.
Nick said that aliens could be using the birds to surveil us and send secrets back to their mothership.
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Nick said: “If aliens want to hack into and control a living organism, or construct a drone that’s a perfect mimic, it would be best to choose something ordinary and ubiquitous, like a seagull or a housefly.
“Something you wouldn’t normally pay much attention to, perhaps.
“But all the time, it would be spying on us, recording everything, and sending information about us back to the alien homeworld.
“So next time you move to swat that fly, watch out – your actions might inadvertently start an interstellar war!”
He added: “If aliens are secretly monitoring Earth, they’ll be doing it up-close-and-personal – not with distant telescopes, but a way that would enable them to get crystal clear images and recordings, right under our noses.
“Any civilization capable of getting here from other star systems undoubtedly has technology that would seem like magic to us, and one possibility is that they might be able to implant a living creature with tiny cameras and recording devices, and then control its thoughts to position it anywhere of interest.
“A related alternative would be to construct drones that are indistinguishable from an animal, a bird or an insect. If that sounds like science fiction, it isn’t.
“People have probably seen on the internet some images of insect-like drones that spy agencies allegedly use.
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“As ever, if that’s the stuff they’re showing you, what else have they got that they aren’t showing you?
“By way of comparison, aircraft like the stealth fighter and the stealth bomber were flying for years before they were public knowledge.
“The military and the intelligence agencies have things that look like they come out of a sci-fi movie or a James Bond film.
“There are some real-life Qs out there, for sure, so just imagine what an alien Q could do!”
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