Spring migration is in full swing in the birding world as many bird species work their way north to breeding grounds.  One of the common springtime migrants is the Greater Yellowlegs.  They breed farther north on the Canadian tundra.  These shorebirds are well known for making a series of musical, whistled notes.  This large sandpiper has mottled brown, gray and white upperparts, a long slightly upturned bill, and yellow legs. Like many shorebirds, they have an affinity for the foraging and feeding in shallow waters and tidal mudflats.  This Greater Yellowlegs was recently seen along the southern side of Salt Pond off of Surf Drive.