Documentation and discussion of Northern Cardinal Eye Disease or Avian Conjunctivitis. The resident Northern Cardinal couple in Backyard North which don't really come to feeder that often and are pretty skittish, presented with red, swollen, runny, and crusty eyes - a pretty clear sign of avian conjunctivitis or House Finch eye disease (also called Mycoplasmal conjunctivitis). This disease is most often seen in finches, especially House Finches and Pine Siskins, but I have never before seen a sick cardinal in any manner in any location other than some annual molting issues which were temporary. Heartbreaking to see such beloved backyard birds in this condition. Fortunately each one only had one eye in bad shape and remained able to care for themselves and get around spending much of their time at the fresh spring in the woods. The good news is they appear well on the mend.
Links to sources and more information:
https://feederwatch.org/learn/sick-bi...
https://feederwatch.org/learn/house-f...
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