A swan was attacked by a gang who used a catapult to fire a ball bearing into its beak.
Police are hunting for the attackers who left the swan in excruciating pain following the incident last week.
The male sawn, who does not have a name, was picked up from Truss's Island in Surrey on Friday morning and taken to their treatment centre nearby.
Dot Beeson, founder of the Swan Sanctuary, said:
The sanctuary has reported the incident to the police, along with a similar incident in the area involving three geese that were mutilated.
All swans in the UK are owned by The Crown and harming them is a criminal offence.