There will be an inconspicuous peach-shaped spot on the side of their heads.
After the age of 4, the wandering albatross can fly to the birthplace accurately and start looking for a spouse.
They don't rely on magnetic fields, stars or the sun to navigate.
Although I don't know how it remembers a small point on this vast ocean. This may be a kind of watch engraved in genes, coming across the ocean to find you!
They usually have to "investigate" for a year or two before they can identify this kind of "marriage", because the wandering albatross only comes of age at the age of 6-7.
Male and female will share the responsibility of raising offspring, and the feeding process will continue until the young birds grow up to be two-thirds older than their parents.
Then, they will return to their drifting route and start wandering alone! Until the next breeding season, two birds that have not seen each other for a long time reunite.
Don't ask them if they will feel lonely. Perhaps, they are born lonely, wandering alone at sea, chasing ships coming and going. ...