What is "rubythroat"

Rubythroat \Ru"by*throat`\, n. (Zo["o]l.) Any one of numerous species of humming birds belonging to Trochilus, Calypte, Stellula, and allies, in which the male has on the throat a brilliant patch of red feathers having metallic reflections; esp., the common humming bird of the Eastern United States ( Trochilus colubris).

n. 1 Any of several species of birds, the males having a brilliant patch of metallic red on the throat. 2 # (taxlink Archilochus colubris species noshow=1), the ruby-throated hummingbird. 3 # Two species of genus ''Luscinia'', (taxlink Luscinia calliope species noshow=1), the Siberian rubythroat, and (taxlink Luscinia pectoralis species noshow=1), the white-tailed rubythroat. 4 # (taxlink Pycnonotus dispar species noshow=1), the ruby-throated bulbul.