Everyone Poops. But Birds don’t fart.
It’s not that they can’t, you see. It’s just that they don’t need to.
Generally speaking, their bodies don’t produce the bacteria that is responsible for the gas in other creatures.
If, however, you are a bird owner, and you think your bird is guilty, you’d better get said bird to the vet ASAP. Gas in a bird’s intestinal system is a big problem.
Cats and Dogs, on the other hand, fart often. This I know from unfortunate personal experience.
Source: Nerdular Nerdance

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According to this Snopes article, feeding Alka-Seltzer to Seagulls does not make them explode. Nor does feeding rice to pigeons. This is commonly used for the reason why you can't throw rice at weddings anymore, but it usually just has to do with the fact no one wants to clean up the rice afterwards.