The animal that stays with it's mate forever is the Gray Wolf.
Gray wolf packs will live within a strict social hierarchy that is led by the alpha male and his mate and he stays for life.
Beavers are also one of the few mammals that mate for a lifetime, only choosing to find another mate if their original mate dies.
The animals that mate for life even after death are beavers, otters, wolves, some bats and foxes and a few hoofed animals.
Beavers are one of the few mammals that mate for a lifetime, only choosing to find another mate if their original mate dies.
But here's where it gets interesting: there are two types of beavers, European beavers and North American beavers.
Beavers are large, semiaquatic rodents in the genus Castor native to the temperate Northern Hemisphere.
There are two extant species: the North American beaver and the Eurasian beaver.
Beavers are the second-largest living rodents after the capybaras.
As beavers rarely approach humans, they are neither gentle nor aggressive.
You can coexist peacefully with these animals if you keep a distance between them and yourself.
The animal that dies after mates is the male Kalutas.
Male kalutas, small mouselike marsupials found in the arid regions of Northwestern Australia, are semelparous, meaning that shortly after they mate, they drop dead.
This extreme reproductive strategy is rare among vertebrates —only a few dozen are known to reproduce in this fashion, and most of them are fish.