The bird book says he is a Fairy Tern (Gygis Alba), a native in Hawai'i and not to be confused with the Australian Fairy Tern. To avoid confusion, he is better known as White Tern. Or by his Hawaiian name, Manu o Ku. He is a listed as threatened species, but his numbers are increasing. He's migratory, arriving in April and leaving again in September. Some breeding pairs like Hawaii so much that they remain here year round.
He is described as friendly and curious, not afraid of people. Nope, not afraid; I thought one was going to land on my head the other day! A fish-eating sea bird, but raises its young on a tree branch -- sans nest. Raises only one chick at a time, but may have three nesting cycles in a season.
More looking. The Fairy Tern may be threatened, but is considered a common bird in the major parks around Oahu and in the unpopulated islands and atolls of the northern end of the Hawaiian chain. He is also the official bird of the City of Honolulu.
Don't forget to pray ....
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