The golden pheasant (Chrysolophus pictus) is locally established in the United States, as appear to be other pheasants of less common species. The Reeves’ pheasant (P. reevesi) is at large on some English estates. Of the partridges, the continental red-leg (Caccabis rufa) is established in England, and its ally, the Asiatic chukore (C. chukar), in St Helena, as is the Californian quail (Lophortyx californica) in New Zealand and Hawaii. The latter, however, though thriving as an aviary bird, has failed at large in England, as did the bob-white (Ortyx virginianus) both there and in New Zealand.
The desirable character of the grouse as game-birds has led to many attempts at their acclimatization, but usually these have been unsuccessful; the red grouse (Lagopus scoticus), however, the only endemic British bird, is naturalized in some parts of Europe.
Of waterfowl, the Canada goose (Branta canadensis) is naturalized to a small extent in Britain, and also, to a less degree, the Egyptian goose (Chenalopex aegyptiacus); the latter bird also occurs wild in New Zealand. The modern presence of the black swan of Australia (Chenopis atrata) in New Zealand appears to be due to a natural irruption of the species about half a century ago as much as to acclimatization by man, if not more so.
Birds of prey are, unjustly enough, regarded with so little favour that few attempts have been made to naturalize them; the continental little owl (Athene noctua), however, has for some time been well established in England, where it has hardly, if ever, appeared naturally.
Pigeons have been very little naturalized; the tame bird has become feral locally in various countries, and the Chinese turtledove (Turtur chinensis) is established in Hawaii, as is the small East Indian zebra dove (Geopelia striata) in the Seychelles, and the allied Australian (G. tranquilla) in St Helena. There has also been very little naturalization of parrots, but the rosella parrakeet of Australia (Platycercus eximius) is being propagated by escaped captives in the north island of New Zealand, and its ally the mealy rosella (P. pallidiceps) is locally wild in Hawaii, the stock in this case having descended from a single pair intentionally liberated. Attempts to naturalize that well-known Australian grass-parrakeet the budgerigar (Melopsittacus undulatus) in England have so far proved abortive, and none of the species experimented with in Norfolk and Bedfordshire effected a settlement. The greyheaded love-bird (Agapornis cana) of Madagascar is established in the Seychelles. Some of the passerine birds have been the most widely distributed, especially the house-sparrow (Passer domesticus), which is now an integral, and very troublesome, part of the fauna in the Australasian States and in North America. It is, in fact, as notorious an example of over-successful acclimatization as the rabbit, but in Hutton and Drummond’s recent work on the New Zealand animals (London, 1905) it is not regarded in this light, considering that some very common exotic birds were needed to keep down the insects, which it certainly did. Even in the United States also, it has been found a useful destroyer of weed-seeds. The house-sparrow is also feral in Argentina, some of the West Indian islands, Hawaii and the Andamans.
The allied tree-sparrow (P. montanus) has been locally naturalized in the United States; it is a more desirable bird, being less prolific and pugnacious, but it is expelled from towns by the house-sparrow.
The so-called Java sparrow (Munia oryzivora), although a destructive bird to rice, has been widely distributed by accident or design, and is now found in several East Indian islands besides Java, in south China, St Helena, India, Zanzibar and the east African coast. An allied but much smaller weaver-finch, a form of the spice-bird (Munia nisoria punctata), is introduced and well distributed over the Hawaiian islands. The little rooibek of South Africa (Estrilda astrild) has been so long and well established in St Helena that it is known in the bird trade as the St Helena waxbill, and the brilliant scarlet weaver of Madagascar (Foudia madagascariensis) inhabits as an imported bird Mauritius, the Seychelles and even the remote Chagos Islands.
Returning to the true finches, the only one which can compete with the house-sparrow in the extent of its distribution by man is the goldfinch (Carduelis carduelis), now established all over New Zealand, as well as in Australia, the United States and Jamaica. It bears a good character, and is one of the marked successes of naturalization. The redpoll (Acanthis linaria), chaffinch (Fringilla coelebs) and greenfinch (Chloris chloris) are established in New Zealand, the last named being a pest there, as is also the cirl-bunting (Emberiza cirlus)—the yellow-hammer (E. citrinella) being perhaps confused with this also.
Among starlings, the Indian mynah (generally the house mynah, Acridotheres tristis, but some other species seem to have been confused with this) has been naturalized in the Andamans, Seychelles, Réunion, Australia, Hawaii and parts of New Zealand. Its alleged destructiveness to the Hawaiian avifauna seems open to doubt.
The European starling (Sturnus vulgaris) is naturalized in New Zealand, Australia and to some extent in the United States. Thrushes have not been widely introduced, but the song-thrush and blackbird (Turdus musicus and Merula merula) are common in New Zealand; attempts were made, but unsuccessfully, to establish the latter in the United States. The so-called hedge-sparrow (Accentor modularis), really a member of this group, is one of the successful introductions into New Zealand. The robin (Erithacus rubecula) failed there.
Rooks (Corvus frugilegus) and the Australian “magpie” or piping crow (Gymnorhina) are to be found in New Zealand, but only locally, especially the former.
Reptiles and Amphibians.—Very little naturalization has been effected, or indeed apparently attempted, in regard to these groups, but the occurrence of the edible frog of the continent of Europe (Rana esculenta) as an introduced animal in certain British localities is well known. An Australian tree-frog (Hyla peronii) is naturalized in many parts of the north island of New Zealand.
Fish.—The instances of naturalization in this class are few, but important. The common carp (Cyprinus carpio), originally a Chinese fish, has for centuries been acclimatized in Europe, where indeed it is in places a true domestic creature, with definite variations. It is, however, quite feral also, and has been introduced into North America.
The Prussian carp (Carassius vulgaris) is established in New Zealand, and the nearly-allied goldfish, a domestic form (C. auratus) of Chinese origin, has been widely distributed as a pet, and is feral in some places.
The gourami (Osphromenus olfax) of the East Indies has been established in Mauritius and Cayenne, being a valuable food-fish.
The most important case of naturalization of fish is, however, the establishment of some Salmonidae in Tasmania and New Zealand. These are the common trout and sea-trout (Salmo fario and S. trutta); they attain a great size. So far, attempts to establish the true salmon in alien localities have been unsuccessful, but the American rainbow trout (S. irideus) has thriven in New Zealand, and the brook char of the same continent (S. fontinalis) inhabits at least one stream there to the exclusion of the common trout.
Invertebrates.—Many insects and other invertebrates, mostly noxious, have been accidentally naturalized, and some have been deliberately introduced, like the honey-bee, now feral in Australasia and North America, and the humble-bee, imported into New Zealand to effect the fertilization of red clover.
The spread of the European house-fly has been deliberately encouraged in New Zealand, as wherever it penetrates the native flesh-fly, a more objectionable pest, disappears.
The wide distribution of three common cockroaches (Periplaneta americana, Blatta orientalis and Ectobia germanica) is well known, but these are chiefly house-insects.
The common small white butterfly of Europe (Pontia or Pieris rapae) is now established in North America; and the march of the jigger, or foot-infesting flea (Sarcopsylla penetrans) of tropical America, across Africa, has taken place in quite recent years.
