This is not a one off story between two birds. It is quite common in the bird world to mate for life, while remaining faithful through out life's ups and downs.
Birds that I know which mate for life are:
Bald eagle
Lovebirds
Black vulture
Barn owl
Albatrosses
Penguins
Macaroni penguin
Sandhill crane
Atlantic puffin
Mute swan
Scarlet macaw
Goose
Canada geese
Laysan albatross
California condor
Trumpeter swan
Whooping crane
Golden eagle
Osprey
Northern cardinal
Monk parakeet
Eagle
Condor
Cranes
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