Today is #NationalKissingDay! Trumpeter swans not only mate for life but can be spotted showing affection by "kissing" their mates. When they kiss, their necks form a heart shape! #FunFact: Trumpeter swans (Cygnus buccinator) are our biggest native waterfowl. They can be up to 6 feet in length and weigh more than 25 pounds! 📸 P. Cusik #NationalParks #Birds #Nature #Swans