However, Shamshu Miah, 52, from Llandudno was released because of the time he has already spent in custody.
He admitted intentionally killing a wild bird at Llandudno boating pool and possessing a kitchen knife in public.
District judge Andrew Shaw sitting at the town’s magistrates court said it was a “cruel and reprehensible act”.
“You killed the swan at night. It was a cruel and reprehensible act. I don’t know exactly how the animal died. There seems to be speculation you may have bitten it.”
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However, the judge said he had to accept Miah’s version that he killed it with a knife.
The court heard that when he was challenged by police he told them: “I am a Muslim, I am fasting, I needed to eat.”
Jim Neary, prosecuting, said: “When interviewed he said, ‘I was hungry, I had to eat the swan so I killed it, I stabbed it. I did nothing wrong, it was just a bird, I needed to eat.'”
“The officers told him the swan was the property of the Queen and he replied, ‘I hate the Queen, I hate this country.'”
Judge Shaw added: “It’s a taboo act and the only sentence that is appropriate is imprisonment.”
Police were alerted by a householder.
The court heard a community mental health team was anxious to help Miah, who had been going through a period of instability, according to his solicitor.
He had no previous convictions.
Original headline: Hungry man who killed swan jailed