article_snippet: US scientists were astonished when US scientists analysed data from some of the birds US scientists tracked from New England and Canada to the Caribbean, Venezuela and Colombia.
article_snippet: For the study, published in the Royal Society journal Biology Letters, the scientists captured 20 birds in Vermont and another 20 in Nova Scotia and fitted 20 birds in Vermont and another 20 in Nova Scotia with geolocator packs.
article_snippet: Too small to house GPS receivers, 20 birds in Vermont and another 20 in Nova Scotia operated by means of 'solar geolocation' - a method used for centuries by mariners and explorers.
highlights_snippet: US scientists tracked birds from New England to the Caribbean .