A woman who was left baffled when her doorbell kept ringing checked her camera and discovered the culprit was a slug.
Lianne Jennings, 35, kept receiving notifications about unusual activity outside her home in Essex.
But when she checked the footage, she found a slug sliding over the doorbell's camera.
Full-time mum Lianne said: "I was in bed and got notified that something at my front door was making motion.
"I was a bit freaked out first and then when I played it back, I started laughing!”
Watch: Woman shocked after finding out a SLUG had been repeatedly ringing her doorbell
In the unusual video, the slug can be seen slowly emerging into shot from the bottom left corner, its antennas leading the way across the lens.
The night vision setting on the doorbell makes the slug look like it's glowing - leading Lianne's friends to believe it could be an alien.
After Lianne uploaded the footage on social media, people messaged her to say they thought it was funny.
She added: "When I showed my friends, they were a bit freaked out - they gave me the kind of look like they thought there was a ghost or an alien or something.
"That made me laugh because I don’t believe in aliens, but considering I saw two little antennas pop up, it was either a very green man from space or a slug crawling on my doorbell.
"I've had the doorbell for about a year now and my daughter found it very funny - she was a bit freaked out when she watched it this morning, she said it looks like an alien slug."
Lianne said: "When I took my daughter Gracie to school yesterday morning, I did have a look to see if there was a trail but there wasn’t anything there."