Thieves stole 28 birds and a sit-on lawnmower from a garden in Newton Bromswold.
Police are appealing for witnesses after the theft which took place between 6.30pm on Friday, March, and 8am the following morning.
The birds, stolen from an aviary in the garden, were a combination of colours including all yellow, all white and yellow and black, and the red Honda mower was taken from a garage.
Officers are appealing for witnesses or anyone with any information to call Northamptonshire Police on 101.
Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555111.