It celebrates the spring migration of the trumpeter swan. Then they will hatch and turn into feathery little trumpeter swan babies. Birds spotted in the Centennial Valley for example include grouse, sandhill crane and trumpeter swan. The adult trumpeter swan is all white in plumage. The trumpeter swan is the largest extant species of waterfowl. In August 2012, five trumpeter swan cygnets were released in restored wetlands. The trumpeter swan ("Cygnus buccinator") is a species of swan found in North America.