Ruby-throated hummingbird (Calothorax lucifer, Archilochus colubris). Amethystine hummingbird (Calliphlox amethystina) with azure throat feathers puffed out.. Hand-colored steel engraving from H. G. Adams' "Hummingbirds" 1856.. Henry Gardiner Adams (1812~1881) was a prolific poet, writer and editor specializing in educational books for young people. He wrote the text for several of the books in the Young Naturalist's Library including Nests and Eggs of British Birds (1855), Beautiful Butterflies (1871), Beautiful Shells (1856), Favourite Song Birds, etc. His other works include a biography of the explorer David Livingstone (1867).