Professor Orton says the most remarkable songster of the Amazonian forest is the Realejo, or organ bird. Its notes are as musical as the flageolet. Another authority says it is the only songster which makes any impression on the natives. The umbrella bird has a deep, loud, and long fluty note, which can be heard a great distance through the forest. He is black as a crow, and has a crest of waving plumes above his head, while there is a long lobe below his neck covered with blue feathers so glossy that they shine at every movement he makes. [Illustration: HUMMING-BIRDS OF THE ANDES.] Before reaching the river our friends had seen a good many humming-birds, and Frank tried in vain to secure specimens of these tiniest members of the feathered race. On the river he was more fortunate, and he made sketches of some of the most remarkable, after fixing them upon wires, to give the greatest possible resemblance to life. There is one variety that has two long feathers forming the tail; each of these feathers has a broad tuft at the end, and when the bird darts among the leaves and flowers the tail seems like a flash of bright color among the varied hues of the foliage. [Illustration: HUMMING-BIRD'S NEST.] A little past noon the foremost boat drew up at the bank, and the others followed its example. Here they remained an hour, while the boatmen partook of their repast of bananas and parched corn, and the civilized travellers regaled themselves upon provisions better suited to American tastes. Frank and Fred endeavored to take a stroll in the forest, but the way was blocked by vines and thick undergrowth, so that their advance was slight. [Illustration: PAIR OF TOUCANS AND THEIR NEST.] Frank saw a toucan, one of those comical birds, with an enormous beak which seems specially made for devouring bananas; the bird was seated on the sloping trunk of a tree, and close observation showed the head of another bird of the same kind protruding from the wood. Frank guessed rightly that he had come upon a pair of toucans and their nest. The toucan makes his home in a hollow tree, as his bill is quite unadapted to nest-building after the manner of the robin or the oriole. Think of a toucan endeavoring to weave a nest like the graceful structure the oriole hangs from the tree! As well expect to see a lace collar wrought with a crowbar. [Illustration: TANAGERS AND NEST.]