The animal welfare charity is concerned the birds have been gaining access to waste products from a local brewery or alcohol producer.
RSPCA officers have collected a number of birds exhibiting the same symptoms in recent weeks.
Birds from places such as Dawlish, Seaton, Colyton, Exmouth, Exeter, Sidmouth, Starcross and Budleigh Salterton have been treated.
Students take over Radio Exe
Christmas Day special from Xpression FM
Work to start on major Tavistock Road improvements
£45 million scheme moves to phase 2
Last night of the Christmas Proms - REVIEW
Bournemouth Symphony Orchestra at the Great Hall
Christmas snow possible on Dartmoor
That's despite no white-Christmas predicted
Car thug sought
This man may be able to help enquiries
Young teenager stabbed in Plymouth
No arrests made
