The bird that stays with it's mate forever is the mute swan.
The mute swan is a species of swan and a member of the waterfowl family Anatidae.
It is native to much of Eurosiberia, and the far north of Africa
The name 'mute' derives from it being less vocal than other swan species.
Measuring 125 to 170 cm (49 to 67 in) in length, this large swan is wholly white in plumage with an orange beak bordered with black.
It is recognizable by its pronounced knob atop the beak, which is larger in males.
Mute Swan pairs reportedly stay together for life.
However, divorce does occur in less than 3 percent of mates that breed successfully and 9 percent that don't.
They re-mate when a partner dies; how quickly this happens depends on the survivor's gender.
Most birds are far from monogamous.
Most birds do not mate for life, and most of those that do aren't quite as faithful as we'd like to think.
Over 92 percent of all bird species form a pair bond and stay together for at least part of the nesting cycle.
Monogamy isn't limited to creatures on land.
According to the U.S. Fish & Wildlife Service, the seahorse is just one of many sea creatures that mate for life.
And fun fact: In these monogamous couples, it's the male that gives birth to the offspring.
About 90 percent of bird species are monogamous, which means a male and a female form a pair bond.
But monogamy isn't the same as mating for life.
A pair bond may last for just one nesting, such as with house wrens; one breeding season, common with most songbird species; several seasons, or life.