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Finch

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True finches are small to medium-sized birds in the family Fringillidae. These birds are part of a large group called passerines. They are found almost everywhere in the world. You can find them in the Americas, Eurasia, and Africa. However, they are not native to Australia or the polar regions. Most finches stay in one area and do not migrate.

American Goldfinch-27527
American Goldfinch-27527

Most finches have a very specific body shape. They usually have stout, conical bills. These cone-shaped beaks are strong and thick. They are perfectly adapted for eating seeds and nuts. Many finches also have very bright feathers. They get these colors from carotenoid pigments. These pigments create bright yellows and reds. Because of these pigments, blue colors are very rare. When yellow pigments meet blue structural colors, they turn green.

Euphonia laniirostris (Eufonia gorgiamarilla) - Macho (14010810322)
Euphonia laniirostris (Eufonia gorgiamarilla) - Macho (14010810322)

Finches are divided into three main subfamilies. The first is Fringillinae, which contains only one genus: the chaffinches. The second is Carduelinae, the largest group. It contains 183 species and 49 different genera. This group includes siskins, redpolls, and the Hawaiian honeycreepers. The third subfamily is Euphoniinae. This group includes the genera Euphonia and Chlorophonia.

American Goldfinch-27527
American Goldfinch-27527

Scientists have worked hard to understand how these birds are related. The name Fringillidae was introduced in 1819. An English zoologist named William Elford Leach created the name. For a long time, grouping finches was very difficult. Many birds look similar because they live in similar environments. This is called morphological convergence. Around 1990, scientists began using DNA studies to help. They looked at mitochondrial and nuclear DNA sequences. These studies changed how we classify many birds. For example, the euphonia was once thought to be a tanager. DNA proved it was actually a finch.

Euphonia laniirostris (Eufonia gorgiamarilla) - Macho (14010810322)
Euphonia laniirostris (Eufonia gorgiamarilla) - Macho (14010810322)

Finches vary greatly in size. The smallest true finch is the Andean siskin. It measures only 9.5 cm in length. The largest is likely the collared grosbeak. It can reach a length of up to 30 cm. Some species are also quite heavy. The evening grosbeak has a recorded weight of 100 g. These birds have specific feather counts too. All true finches have 9 primary remiges. They also have 12 rectrices, which are tail feathers.

Many finches have different colors based on their sex. This is called sexual dichromatism. In many species, the males are much brighter than the females. Females often lack the bright red or yellow markings. Most finches are granivorous, meaning they eat seeds. However, some groups eat different things. The euphoniines eat berries and small arthropods. The Hawaiian honeycreepers are even more diverse. They evolved to drink nectar from flowers. This process is known as adaptive radiation.

Finches have played important roles in human history. From the eighteenth to the twentieth century, they were used in coal mines. Miners in the UK, US, and Canada used finches and canaries. These birds helped detect carbon monoxide gas. This was a vital safety practice for workers. The practice finally ended in the UK in 1986. Today, many people keep finches as pets. The domesticated canary is a very famous example. People enjoy their beautiful songs in their homes.

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File:Euphonia laniirostris (Eufonia gorgiamarilla) - Macho (14010810322).jpg
Euphonia laniirostris (Eufonia...
File:American Goldfinch-27527.jpg
American Goldfinch-27527.jpg
American goldfinch.webm
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