More than 400 budgies have been stolen from a breeder in Romsey.
They are thought to be worth around £60,000.
The 74-year-old victim had been collecting the birds for over 50 years.
They were in a large, locked aviary in his back garden in Upton Crescent, which also had security lighting.
The budgies are thought to have been stolen some time between 10pm on Sunday 13th October and 4:45am on Monday 14th October.
The birds were stolen in special transportation cages that belonged to the victim.
Only 7 birds were left in one cage the thieves left behind.
Police believe the thieves escaped with the birds through a golf course which runs behind the property.
All the birds have rings on their legs with serial numbers on.
Officers are appealing for any witnesses. Please call PC Kat Smith at Romsey Police Station on 101.