The parents of the final surviving peregrine chick born in a nest on top of Worcester Cathedral have stopped feeding it.

Adult birds Peter and Peggy had produced four eggs, with the first hatching on Easter Sunday. However, two chicks died last week, with the fourth failing to hatch.

The remaining chick became sick on Thursday, not calling for food and acting lethargically, which the parents noticed and made no attempt to feed – they will not normally feed ill chicks.

A post on peregrine falcons in Worcester stated that it had been decided to shut down the livestream.

The post said avian flu could be the cause of the bird's sudden sickness as it displayed three to four symptoms.

"No interest was shown when the adult female landed with prey and proceeded to eat it the box.

"This would also explain why the chick stumbled backwards onto the ledge yesterday.

"If by any chance there is a recovery we will restart, but highly unlikely," the Facebook post said.

The update comes days after the bird was reported to be doing fit and healthy.

"What tends to happen is, as the chicks get lower in number, one chick will get fed really well," Chris Dobbs, a wildlife expert at the cathedral previously said.

Progress in the nest has been livestreamed on YouTube, in a repeat of last year when nearly 500,000 people tuned in from across the world.

"A sad end to this year's season but looking for positive results next year," the post said.