143792 Whooper Swan Cygnus cygnus L 150-160cm. Similar to Mute Swan but separable using bill shape and colour. Typically holds neck straight, not curved. Seen in medium-sized flocks comprising several family groups. Sexes are similar. Adult has mainly pure white plumage although head and upper neck is sometimes stained orange. Bill is triangular and rather long, with yellow patch that extends beyond nostril. Juvenile has grubby buffish grey plumage and dark-tipped pale pink bill. Voice Utters loud, bugling calls. Status Handful of pairs breed here each year, but best known as a winter visitor; several thousand present Oct-Mar.