How about getting them a pair of binoculars specifically designed for birdwatching? A good brand for them could be Vortex or Nikon. Another idea is getting them a book about local bird species with beautiful illustrations and information about their habits, habitats and calls. You could also get them a birdhouse or a bird feeder to encourage birds to visit their garden or backyard. Lastly, you could consider gifting them a birdwatching tour or trip to a nearby wildlife refuge or conservation area, where they can enjoy seeing various species in their natural habitats.
Or you can get her/him a star map with the date of the wedding.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.