The wolf pair mates for life in order to establish their position as pack leaders. They produce a new litter every year to ensure the stability of the rest of the pack, as per a BBC Earth report.
Eurasian beavers pair up and mate for life to increase their chances of survival.
According to Thomas Geissman and Mathias Orgeldinger’s study, the gibbon pairs perform ‘duet’ songs, which are a series of their individual mating calls, combined into a song that becomes essential to their bond.
A study on Behavioural Ecology and Sociobiology by David J. Gubernick and J. Cully Nordby discovered that the majority of mice remained loyal to their partner when they were placed with another mouse.
These slow-moving lizards return to their same partners every year in the mating season.
As per a study by Wey-Lim Wong and Stanislav Gorb, each individual Diplozoon paradoxum, a flatworm, conjoins with another so that it can reach adulthood.
Once a male vulture finds a partner, a courtship pattern transpires that at times concludes with a mid-air mating dance.