Momma Swan & her 'swanling'? Okay, Google Now... 'The male swan (the cob) helps the female (pen) look after their babies, (cygnets, derived from the Latin word for swan, "cygnus") until they are a year old. The young don't spend more than one day in the nest once they hatch.'
The TRUMPETER SWAN is a species of swan found in North America. The heaviest living bird native to North America, it is also the largest living species of waterfowl with a wingspan that may exceed 10 ft. Adults usually measure 4 1/2 - 5 1/2 feet long. Around 85% of the world's breeding population is found in Alaska