Answer:
The answer is difficult because the question seems to refer to information that is not provided.
In fact, it refers to several aspects, some of which are literary: The Birds of Daphne du Maurier; the film adaptation of du Maurier's work in Alfred Hitchcock's film of the same name; and another aspect of a biological nature in referring to the colonising capacity of the species of finches as opposed to the native species of a given environment.
I will focus my answer on this last aspect.
The finches are birds that have a distribution almost in its totality at world-wide level, they are found through the American countries, in the Eurasian and African countries, as well as in several groups of islands like for example: the Hawaiian Islands. They are not present in Australasia, the Antarctic, the South Pacific and the islands of the Indian Ocean, although several species from Europe have been greatly annexed in New Zealand and Australia.
The finch is a typical inhabitant of well-forested areas, although several can be found in mountains and even in deserts.
In the United States the native range of the domestic finch extends from Oregon, Idaho and northern Wyoming to California, New Mexico and Mexico, eastward to western parts of Nebraska, Kansas and Texas. A shipment of house finches was introduced to Long Island, New York in the 1940s. After struggling to survive for several years, the population finally established itself and has spread throughout the eastern portion of the United States coast. They now live from southern Canada south to the Gulf of Mexico, along the east coast and as far west as the Mississippi River.
From a few Californian individuals released from a pet store in New York City in 1939, and through the natural expansion of its western range, in just a few decades this species came to occupy one of the broadest ecological ranges of any bird in existence. Originally a bird of warm climates and dry open habitats of the Southwest, it now lives in almost every type of landscape and climate in North America, from the edges of northern forests to ocean shores and metropolitan areas.
This dramatic expansion of the ecological range has been associated with an amazing phenotypic diversification in morphology and physiology, allowing this species to persist under diverse ecological conditions displacing other native birds because of its extraordinary ability to adapt to different environments.
Darwin proposed his theory of evolution by observing and examining finches in the Galapagos Islands. Darwin noted that 14 species of Galapagos finches have common ancestors that arrived in the Galapagos Islands millions of years ago. One particular type of finch evolved into 14 different types of birds as a result of adaptation to different types of food and habitat, although this Darwin's finch no longer belongs to the family Fringillidae.
