How about getting him a wildlife tracking kit? You could include field guides, animal tracking cards or posters, a tracking journal, a tracking stick or measuring tape, and perhaps even a tracking camera or binoculars so he can observe the animals from a distance. Alternatively, you could book an outdoor adventure day with him and a wildlife guide, where he can learn first-hand about the tracks and signs of the animals in his area. Whatever you decide, I think he will love it and appreciate your support for his passion.
Or you can get him a star map with the date when he was born.
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.