Bobolink

As migrant songbirds go, few can outdo the Bobolink when it comes to endurance. Breeding in grassland habitat in the northern US and southern Canada, a single individual may fly 6,200 mi (10,000 km) south to its winter range in Paraguay and Argentina - and then back again come spring. If you believe the poet William Cullen Bryant, the bird's common name is a shortening of his full title, "Robert of Lincoln"; but it's more likely it's simply a phoneticization of its beautiful, metallic song. Do you hear it?
[Photo by JanetAndPhill on Flickr; CC-licensed]