A Vulcan named Stork works at the Terran adoption agency. Parents always request that he be the one to deliver their child to them.
It’s years before anyone explains it to him.
People keep gifting him robes with long white birds on them.
Stork: So it is considered a sign of good fortune based on traditional American folklore?
Steve: I mean, I guess. Illogical?
Stork: Perhaps. However traditions define a culture. Vulcans have many with no objective purpose as well. I would be pleased to comply.