This seems equally logical and incredible to me. What do you think? https://www.cbc.ca/news/science/cig...arette butts,researchers in Mexico have found.
Reminds me of 'anting'. This hypothesis suggests that birds use the chemical secretions that come from ants to control and rid of parasites in their feathers. Microorganisms such as bacteria and fungi can destroy a bird's feathers if their numbers get large enough. Formic acid is a commonly produced chemical by ants, and it was found to inhibit growth of feather destroying microorganisms. Anting (bird activity) - Wikipedia. Out My Backdoor: Questions and Answers about Anting | Department Of Natural Resources Division
