When the grey falcon soars overhead the birds display varied forms of strategy. The inconspicuous pigeons crouch motionless but alert, their eyes fixedly following the circles of the enemy; the readily detected graucalus fly straight to a forest tree, whence there is a clear get-away; the companies of yellow white-eyes, with a unanimous note of alarm, dart into the jungle; the caterpillar-eaters and the honey-eaters, peering about, drop discreetly down among the lower branches, and silence prevails. No serious heed is taken of the white-headed sea-eagle. Though the fruit-eaters do not recognise the lordly fellow on the instant of his appearance, he may perch on the topmost branches of the tree to scrutinise the shallows, and they will resume their feasting and noise. But a falcon is as a death's-head, and alas! too often a sanguinary disturber of the peace, as the tufts of painted feathers tell. AUSTRALIA'S HUMMING-BIRD One of the most self-assertive of birds of the island is also one of the least--the sun-bird (CINNYRIS FRENATA). Garbed in rich olive green, royal blue, and bright yellow, and of a quick and lively disposition, small as he is, he is always before his public, never forgetful of his appearance, or regardless of his rights. Feeding on honey and on insects which frequent honey-supplying flowers, the sun-bird is generally seen amid surroundings quite in keeping with the splendour of his plumage. The best part of his life is passed among blossoms, and he seems to partake of their beauty and frailness. The gold of the gin-gee, the reds of the flame-tree, the umbrella-tree, and of the single and double hibiscus are reflected from his shining feathers, as he flutters and darts among the blooms, often sipping on the wing after the habit of the humming-bird--which he resembles even to the characteristic expansion of the tail feathers. When in September the flame-tree is a dome of red, sun-birds gather by the score--the gayest of all the revellers. Uncommon length of bill enables them to probe recesses of flowers forbidden others, and they seem proud of the superiority. The varied-honey-eater visits flower after flower with something of method. The sun-bird flashes from raceme to raceme, sampling a dozen blooms, while his noisy rival sips with the air of a connoisseur at one. There is a spell in the nectar of the flame-tree as irresistibly attractive to taste of birds as the colour is to the sight of man. Although the tree bursts into bloom with truly tropical ardour, they await the coming banquet with unaffected impatience. Then one of the prettiest frolics of the sun-bird is revealed. Time cannot lag with such gay, saucy creatures, so while they wait half a dozen or more congregate in a circle and with uplifted heads directed towards a common centre sing their song in unison. Whether the theme of the song is of protest against the tardiness of the tree, or of thanks in anticipation, or of exultation in race, or of rivalry, matters