Totally myth. Most pigeon feed mixes contain uncooked rice.
Something to consider, when you cook rice it takes a while and boiling temps. Although it swells it becomes mushy and can be compacted. The crop is very stretchy and even if they felt discomfort, they can simply throw up. Pigeons can do that a lot more easily but other birds can cough it up too. I always said if this myth was true, there'd be bits of dead birds all over Asia from where they "exploded" after swelling LOL
Edited by Mary Of Exeter - 2/24/12 at 4:27pm