"Is it a person with a strange hat who likes to walk at night? A chupacabra? Do you have any ideas of what this UAO -- Unidentified Amarillo Object could be?" the post said.
Michael Kashuba, City of Amarillo's director of Parks and Recreation, said city officials want members of the public to submit their theories.
"It is definitely a strange and interesting image," Kashuba told KXAS-TV. "Maybe Amarillo can help solve the mystery of our UAO."
He said local authorities do not believe any crime was committed.
"It is [also] important to note that this entity was outside of the Amarillo Zoo," Kashuba said. "There were no signs of attempted entry into the zoo. No animals or individuals were harmed. There we no signs of criminal activity or vandalism."