It seems backpackers and grey nomads are not the only life-forms that come back to the Northern Territory for the start of the dry season.

There has been a spate of UFO sightings across the NT in the past week and high-profile Acacia Hills UFO spotter Alan Ferguson said the UFOs were back in his patch on Sunday night - the first time they had been seen since last dry season.

"They are back, son," he said.

"It's always the way, right on cue. The dry season starts and there they are. They are like the grey nomads. Once the dry season comes, you can't get rid of them."

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