Black nape Tern - Juvenile

I would say, this is one of my favorite Tern's pictures on my trip to Ujung Kulon National Park - Indonesia. Lovely white Tern with narrow black nape and narrow black bill. Which is I found it on the " Keramba " in the middle of the ocean. It was very challenging experiance to take a photographs from the the boat, and the object was flying. I'm very happy I've got this. It is smallish bird 31 cm, have a long fork tail in adult, and rounded unforked tail in immature. Young birds have a mottling on crown and blackish mottling on the nape.