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Volume 10, 1877
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Art. XXIX.—Disappearance of the Small Birds of New Zealand.

[Read before the Auckland Institute, 22nd October, 1877.]

Amongst the many changes which pass almost unnoticed by the majority, one much to be deplored goes on around us daily, which promises to deprive our forests of one of their chief attractions. I allude to the destruction of its smaller feathered inhabitants, amongst which unfortunately are numbered our singing birds.

In detailing the cause of this destruction it may be well to give a short description of the birds which are disappearing, together with some idea of their habits, as also those of their destroyer, the rat. This animal sails in ships all over the world, an unwelcome passenger, and makes its way ashore on every land. Its first proceeding is to kill and eat the aboriginal rat of the country, which it then takes possession of and colonizes.

The country from which this rat first sprung is supposed to be India or Persia. We are accustomed to call it the Norway rat, probably from the accidental circumstance of its coming first from that country to England; but the Germans call it the “wandering rat,” and it is said to have made its appearance in different European countries almost at the same time.

The native species was a small black animal, and much prized by the natives as an article of diet. Their method of capture was to construct a pit wider at the bottom than the top; then strew some roasted hinau berries over the floor, and place a log to serve the rats as a ladder. After a night or two, when the rats had got accustomed to being fed in this manner, the log was removed. The rats, unable to resist the savoury smell of their

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favourite food, jumped boldly down. On seeking to return they were prevented by the overhanging sides of the pit, and in the morning the Maori hunter found them safely trapped. These pits may still be seen on remote ranges; they formed a fruitful subject for dispute; and a common claim made by a native in the present Land Courts is, that his ancestors hunted rats over the part under discussion.

But the Maori species seems to have been a vegetarian, and with him we have no more to do. Our rat on the other hand appears to have but little choice in the article of diet, eating indiscriminately berries and fruit, fish, flesh, offal, and carrion; eggs they have a special predilection for, and some amusing stories are related of their clever theft and adroit removal of these delicacies, under circumstances of unusual difficulty.

They are expert climbers, and any old bushman must have witnessed the celerity with which they run along a small twig or supplejack; in fact, they appear quite as much at home amongst the tree-tops as in the sewers of London or Paris. In the bush their numbers are prodigious; and if a party remain at a camp long, they become very bold and troublesome, causing sometimes thoughts of being eaten alive by them, which fate is said to have actually overtaken men in the sewers of Paris. With those tastes, then, coupled with their enterprising disposition and ferocious habits, it can be readily imagined how, after the slaughter of their Maori brethren, they should direct their attention to robbing birds' nests and eating the young.

After thus noticing the rats we now come to the birds, which have suffered most from their ravages; and it is a significant circumstance that, while some birds below a certain size have almost entirely disappeared, the larger ones seem to remain as plentiful as ever; and those of middle size, such as the kokako and tui, although diminished in number, still continue to enliven the forests with their song. This fact points to a defence of their nests, made by the larger birds with success, but doubtful in the case of the middle-sized ones, and depending on the boldness of the rat; while it would be almost hopeless in the case of the smaller ones.

Amongst the birds which are becoming scarce, the first we shall notice is the kokako, a brown bird somewhat larger than a tui, with a bluish tinge about the head and throat; it has a long-drawn note, somewhat nasal, but very melodious withal, and which harmonized well with a full chorus of birds; but this is now seldom heard.

The appearance of the tui must be so familiar to all as to need no further notice than a simple mention of the fact, that their numbers are sadly thinned within the last twenty years.

Amongst the birds which have altogether disappeared, we must include the bell-bird (korimako) and robin (pitoitoi). The former seemed to be

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the first victims, and their disappearance dates some fifteen years back, since which time it has been a rare sight indeed to see one; this loss is much to be regretted, as the bell-bird was by far the best songster of the New Zealand forests.

The robin was a small brown bird of peculiarly gentle aspect and tame disposition, resembling in fact his English namesake in everything except colour. The disappearance of these birds began nearly about the same time as the bell-bird, and now the rising generation will scarcely ever have seen a single individual of the species.

It is somewhat singular, however, that while these and other birds have become extinct in this part of the island, some of the smaller kinds have suffered apparently but very little diminution; and with a reference to these we will conclude the chapter.

Most notable amongst the survivors are the fan-tail or fly-catcher, and the riroriro. No other bird forces itself so much on the attention of the dweller in the bush as the fan-tail. They haunt about a camp and find an easy subsistence on the flies which there congregate, darting about with outspread tail in pursuit of their prey, and giving vent to their feelings in a sharp, petulant note.

On resuming the occupation of an old whare at times, some of these little creatures will pay an early visit to those whom they evidently look upon as old friends and benefactors, and on such occasions they will plainly testify their satisfaction at a renewal of the intimacy.

The riroriro, which corresponds to the old country wren, is a small grey bird of unpretending appearance, but, like many unassuming individuals of our own species, they belie their looks, possessing a more than usual share of sagacity and instinct. Their nest is shaped like a pear, with a door in the side sheltered by a small veranda-like projection, and the natives aver that this nest is built so that the door is always turned in the direction opposite to the prevailing wind of that year. Finding a nest then in the spring, with the hole faced to the north, a season of southerly winds and consequent fine weather may be predicted, and vice versá.

It is said that the severity of a winter in North America may be predicted by the quantity of nuts found in the hoard of a squirrel, and similar instances of prophetic sagacity might be multiplied; in fact, instinct taken by itself is utterly beyond our comprehension, and cannot be accounted for by any effort of human reason. There is no doubt, however, that the bird is weather-wise beyond the common, and a well-known Maori song alludes to it thus:—“The riroriro sings, it is a sign of the approaching summer.” This peculiarity I can vouch for myself; on many occasions my attention was drawn by the continued singing of these birds, and it was

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always followed either by spring or else a long continuance of fine weather.

It is possible that the fact of these birds' nests being hung to sprays so slender that they will not bear the weight of even a rat, may account for their survival, but certain it is they have suffered very little. Whether the spread of cats will affect the birds or rats most remains to be seen; but judging from the change produced in this neighbourhood, it would appear that the rats suffer severely from their natural enemies, and whereas they swarm in thousands throughout some parts of the bush, in other localities food may be left for weeks and remain untouched. This phenomenon has only been noticeable of late years, and points to the establishment of cats at different parts of the forest.

Before concluding this paper I would briefly notice the action of the Acclimatization Society in introducing useful birds, and it seems hard that a body of men who spend so much time in trying to benefit their country, should be held up to the execration of their fellow-colonists. The circumstances in which country settlers are placed must be allowed, however, to be very peculiar, and the irascible tone of the sufferers whose letters may be seen weekly is caused by the following facts,—the sparrows and yellow-hammers which are now devastating the young grain crops, etc, have not yet become accustomed to the country, nor has the habit of feeding on grain which they learnt on the passage out left them; it may even be handed down from the parent birds to their young.

Again, grain-producing farmers here are few, scarcely more than one out of six, and these unlucky wights perhaps live in isolated spots, surrounded by large wastes or forests, where their feathered enemies breed unmolested, the birds are not evenly spread over the country, but moving about in waves, and always most numerous on their front. A single farmer may thus have to feed a number of birds which in the old country would have been distributed amongst a hundred, and their ravages scarcely felt. I am, however, confident that like thistles, blight, and many another scare, this of the birds will pass away also, and much good result from their introduction; caterpillars and other insects have caused more loss than can ever be inflicted by birds, so let us hope that settlers will look past the little inconveniences of the present.