After a busy bird feeding season, some Oklahomans are reporting small, localized die-offs of birds due to a potential Salmonella outbreak at their feeders. The bacterium is passed through droppings and can spread to other birds visiting the feeding station when they come into contact with contaminated droppings. Salmonella may be introduced by the feeding station?s regular visitors, or by roving flocks moving through to their breeding grounds. Common symptoms include lethargy, diarrhea and swelling of the mouth and crop. Birds healthy before the infection are often able to fight the infection, but stressed or young birds may struggle more. Ground feeding birds and longer distance migrants like pine siskins and American goldfinches may be more vulnerable to the bacterium.