Swans

Temperate environments, rarely occurring in the tropics. More commonly found in lakes and rivers in the northern hemisphere, although some reside in Australia, New Zealand, and South America, Azerbaijan (Absheron NP, Qizilaghaj NP, Shirvan NP, Aghgol NP)

With their elongated and curved necks, swans are considered to be very beautiful birds. They usually mate for life, although "divorce" sometimes occurs, particularly following nesting failure, and if a mate dies, the remaining swan will take up with another