Those which introduce into their melody some passages of the nightingale's song are the most esteemed of all canaries; they are called Tyrolean canaries, because they are considered natives of the Tyrol, where they breed many of these birds. The second are the English canaries, which imitate the song of the wood-lark. But in Thuringia the preference is generally given to those which, instead of a succession of noisy bursts, know how, with a silvery sonorous voice, to descend regularly through all the tones of the octave, introducing from time to time the sound of a trumpet. There are some males which, especially in the pairing season, sing with so much strength and ardour that they burst the delicate vessels of the lungs, and die suddenly. The female, particularly in the spring, sings also, but only a few unconnected and unmusical sounds. Old ones which have done breeding often sing in this way at all seasons. Canaries are particularly remarkable for quickness and correctness of ear, for the great ease with which they exactly repeat musical sounds, and for their excellent memory. Not only do they imitate all the birds in whose neighbourhood they have been placed when young[59], mixing agreeably these songs with their own, whence have arisen those beautiful varieties which each family transmits to its descendants; but they also learn to repeat correctly two or three airs of a flute or bird-organ, and even to pronounce distinctly some short words. Females also have been known to perform airs which they had been taught. I shall conclude this article on canaries by pointing out the best rules for obtaining and preserving good singers. The most essential is to choose from among the young that which promises a fine tone, and to seclude it from all other birds, that it may learn and remember nothing bad. The same precaution is necessary during the first and second moulting; for being likely to re-learn (if I may say so) its song, it would introduce into it with equal ease foreign parts. It must be observed whether the bird likes to sing alone, or in company with others, for there are some which appear to have such whims, liking to hear only themselves, and which pout for whole years if they are not humoured on this point. Others sing faintly, and display their powers only when they can try their strength against a rival. It is very important to distribute regularly to singing birds the simple allowance of fresh food which is intended for the day. By this means they will sing every day equally, because they will eat uniformly, and not pick the best one day and be obliged to put up with the refuse the next.