Polish “environmental EcoLogic Group placed a tracker on the back of a white stork last year to track the bird’s migratory habits. It travelled some 3,700 miles (6,000kms), and was traced to the Blue Nile Valley in eastern Sudan before the charity lost contact. … Somebody found the tracker in Sudan, removed the sim card and put it in their own phone, where they then racked up 20 hours’ worth of phone calls. … The organisation has received a phone bill of over 10,000 Polish zloty ($2,700; £2,064)” https://www.bbc.co.uk/news/blogs-news-from-elsewhere-44645217
It’s good to stork, but beware of roaming charges, especially if you’re hard of heron.
“The bird leaves New Zealand in March to fly some 10,000km to feeding grounds in China and the Koreas. And then in May, the godwit undertakes a 6,000km trip to western Alaska to breed and nest, before returning directly to New Zealand across the Pacific in August/September.” (http://www.bbc.co.uk/news/science-environment-25274483)