Now of course you will think--and you will be quite right to think so--that a bird that has a tail like two little violet rainbows will have the other parts of him beautiful as well. Well, the back of this bird is all green--a beautiful, shining, gleaming green, and his head is green too--at least it seems to be when you see it first; but, as you look at it, all at once the green changes into a heavenly violet blue, to match the heavenly violet blue of its lovely rainbow tail. Under the throat it is green like the rest, but just in the centre of it there is a tiny little drop--just one or two little feathers--of the very loveliest amethyst. Ah, fancy seeing a bird like that flying about and hovering over the flowers. Only you would not _see_ him, for you would not be able to see his wings--at least not properly--they would move so fast. What you would see, would be a little circle of hazy brown mist, and, right in the middle of it, a little sparkling sun, and on the other side, gleaming through the mist, two sweet little violet rainbows. Then all at once there would be a trail of light in the air, and it would all be somewhere else--another sun and rainbows over another flower. Of course, really, a Humming-bird would have flown from one flower to another, but what it would look like would be a gleam of light--a sunbeam--with a jewel-flash at each end of it. [Illustration: TRAIN-BEARER HUMMING-BIRD] Another Humming-bird--the Sappho Comet--is about the same size as the last one, and he is a lovely gleaming green, too--an emerald green, I think--on his head and neck and shoulders, but his throat is light blue--the colour of a most beautiful turquoise. But _such_ a turquoise! There is no other one in the world that ever gleamed and flashed and sparkled in that way, because, you know, turquoises do not sparkle at all--at least nowhere else--it is not their habit. But I think that some of the very finest of them--at least the lovely colours that were in them--must have flown into that Humming-bird's throat and begun to gleam and flash and sparkle there. Perhaps they begged to be allowed to as a very special favour. Then the tail of this Humming-bird is forked too, like the other one's, but not in quite the same way. It is more like the fork of an arrow than two little rainbows turned back to back, and instead of being violet it is all ruby and copper and topaz, with a broad band of velvet black at each tip. I cannot tell you how brilliant those colours are--the ruby and the copper and the topaz. They are so brilliant that, if you were to take them into a dark room, I really almost think they would light it up like a lamp or a candle. Oh, it is a wonderful tail. You might think and think for quite a long time and yet you would never be able to think how bright--how wonderfully bright--it is.