Bones unearthed under a house turned out to be from a cow.
Police initially launched an investigation after being told the bones were human.
The householder unearthed part of a skeleton during renovations at his home in South Street, Lewes. He immediately called police.
The bone fragments were discovered under a layer of concrete and were mixed up in hardcore where a partition wall once stood.
A local doctor and vet were called in and they declared the bones human and detectives were brought in.
As they began their inquiries, the bones were taken to an archeologist in Haywards Heath who determined the remains were, in fact, from a cow.
Neighbourhood Policing Inspector Dave Padwick, who attended the scene, said: "I was sure April Fools Day had come early.
"We attend several reports each year of people digging up or finding bones on their premises.
"Given the historical nature of Lewes, these often turn out to be archeological remains. But we treat each one as a potential crime scene.
"Nevertheless, I think all involved were compelled to raise a smile when we heard the final result in this case.
"The householder was looking forward to the police continuing his renovations for him.
"Now, sadly for him, he must complete the job himself."
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