TIL a Polish charity placed a tracker on the back of a white stork to track the birds migratory habits. It travelled to Sudan before the charity lost contact. Somebody found the tracker, removed the sim card and put it in their own phone, where they then racked up $2700 worth of phone calls.

https://www.bbc.com/news/blogs-news-from-elsewhere-44645217
https://www.reddit.com/r/todayilearned/comments/15iwpy9/til_a_polish_charity_placed_a_tracker_on_the_back/