Swans literally form a heart and are known as the symbol of love all over the world. Swans are monogamous animals, which means they only mate once in their lives. 

Gray wolves operate in packs and generally the alpha male and the female mate for life and lead the pack. 

Barn owls are nocturnals and these adorable birds known for mating for lives. 

These fluffy primates usually live with large families and form monogamous bonds. 

These majestic creatures generally form life-long bonds and stay together for several breeding seasons. 

Macaroni penguins are generally monogamous and life-long bonds with their partners.