A pair of rare and endangered cockatoos nicknamed Elvis and Priscilla have been stolen from their nature reserve home.
Keepers at the Birmingham Nature Centre discovered the two endangered cacatua sulphurea birds - worth £3,500 a pair - missing from their home on Saturday morning.
It is thought the birds were stolen between 7pm on Friday and 7am Saturday.
They are described as about 33cm high, white-feathered with a yellow crest on the tops of their heads and yellow feathers under their wings and tails.
A West Midlands Police spokeswoman appealed for any witnesses to come forward, adding: "Elvis and Priscilla are on a specific diet and will be distressed."
The birds, a rare sub-species from the Sumba Less Islands in Indonesia, are one of only a 100 pairs in the UK and are part of the international breeding programme to boost numbers, said park warden Ken Edwards.
Staff at the Edgbaston centre believe the birds could have been stolen to order and are now concerned for Elvis and Priscilla's welfare in case their new owners cannot properly care for them or has split up the pair.
"They have pinched them to order or someone has come and seen them," said Mr Edwards.