It seems improbable but it is not only birds that migrate; some insects do too. Just lately there has been an influx into Norfolk of Red veined Darters; scarce visitors, presumably from the continent. There aren’t many, just a few to be found in some coastal wetlands.
Such a journey eventually takes its toll and I watched an individual the other day that was so worn and tatty it couldn’t even be bothered when a meal flew by.
Letter From Norfolk 