Las Vegas residents were left astonished to have spotted cowboy hat-wearing pigeons strutting the streets and they have no idea who did this.

The pigeons wearing cowboy hats became viral on social media after Bobby Lee, a Vegas resident, posted a video of two pigeons in red and pink hats on Facebook last week. The video eventually caught the attention of Mariah Hillman co-founder of Lofty Hopes, a pigeon rescue.

Hillman, 47, and her daughter began searching for the pigeons, asking around in the neighborhood where the pigeons were spotted and handing out business cards.

They began getting leads from people who saw the pigeons and sent them videos as proof. When she finally spotted one of the pigeons, Hillman realized that the hat had been glued to their heads.

“He was shaking his head, trying to get the hat off. It’s definitely glue,” she told The Washington Post of the adhesive used on the bird. “We either have to molt it off, which will take time, or have it removed.”

The rescue group put out traps to nab the pigeons, CNN reported. After a two hour chase, Hillman finally caught the pigeon in the red hat, dubbed Cluck Norris. The bird will stay with Hillman for a while to get the hat removed.

Though people have speculated that the hats originated from someone attending the National Finals Rodeo currently taking place in the city, no proof of the same has been obtained, the New York Times reported. The Las Vegas Police department too stayed clear from it, stating it did not appear to be a police matter.

Hillman is currently focusing on catching the birds. Vegas residents have reported seeing other pigeons in grey and brown hats, though Hillman and her daughter are yet to spot them.

Looking out for the birds has become a passing activity for Vegas residents. Kassandra Flores who found Cluck Norris in her mother's neighborhood Monday tweeted a video of the bird.

“I finally found one,” she wrote.

Flores told CNN, she believed the news about the pigeons was fake until she spotted one herself.

"At first it was outside my door and I was excited ... but before I could get a video, he flew away," she told CNN. "And then as I was leaving I [saw] him again and was able to get a video."

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The CIA tried to train pigeons to take pictures of a Soviet shipyard building nuclear attack submarines AFP / Kenzo TRIBOUILLARD