Six teenagers have been questioned over a "sickening" attack in a park in which 18 birds were beheaded, police have said.
Vandals caused around £10,000 damage when they smashed 130 windows at a horticultural centre in Wythenshawe Park, Manchester.
A number of fish also died when fertiliser was tipped into a pond and a frog was speared to death during the attack.
The male suspects, aged between 13 and 18, were arrested on suspicion of burglary, theft and criminal damage. One remains in police custody.
A spokesman for Greater Manchester Police said: "Five have been bailed until August pending further inquiries.
"An 18-year-old man remains in police custody for questioning."
The yobs struck between some time between 4.30pm on Sunday and 10am on Monday.
City officials labelled the vandalism a "sickening act of cruelty".