The Blue-throated Hummingbird is a good sized hummingbird , reaching 11.5 to 12.5 cm ( 4 Â 1\/2 to 5 inches ) in length and 6 to 10 grams in weight . The Blue-throated Hummingbird is a fairly large hummingbird , reaching 11.5 to 12.5 cm ( 4 Â 1\/2 to 5 inches ) in length and 6 to 10 grams in weight .