Swan if a mate dies, the remaining swan will take up with another. The number of eggs in each clutch ranges from three to eight. The English word 'swan', akin to the German "Schwan", Dutch "zwaan" and Swedish "svan", is derived from Indo-European root "*swen" (to sound, to sing). Young swans are known as "swanlings" or as "cygnets"; the latter derives via Old French "cigne" or "cisne" (diminutive suffix -"et" "little") from the Latin word "", a variant form of "cycnus" "swan", itself from the Greek "kýknos", a word of the same meaning. An adult male is a "cob", from Middle
Robert Swan Their journey made Swan the first man to walk to both the North and South poles. In 1992, Swan was invited by the United Nations to be a keynote speaker to the first Earth Summit for Sustainable Development, held in Rio de Janeiro, Brazil. In response to the world leaders' challenge to "think global act local", Swan made a commitment to deliver a global and local environmental mission involving industry, business, and young people to the next World Summit in 2002. In 1996–97, he organised One Step Beyond, The South Pole Challenge, which brought 35 young adventurers from 25 nations