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Rosella

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Rosellas are a genus of colorful parrots native to Australia and nearby islands.

Platycercus details in Gould Synopsis Birds Aust
Platycercus details in Gould Synopsis Birds Aust

They belong to the genus Platycercus, a name that describes their physical structure. The name comes from Greek words meaning "broad-tailed" or "flat-tailed." This refers to the specific shape of their tail feathers. These parrots are medium-sized birds known for their long tails and bright colors. They play an important role in their ecosystems by feeding on various plants.

Platycercus caledonicus -Tasmania -side-8
Platycercus caledonicus -Tasmania -side-8

Most rosellas follow a specific diet of seeds and fruit. When they eat, they use their feet to hold their food items. This allows them to manipulate the food while they consume it. In the wild, they also enjoy bathing in puddles of water. Their social and reproductive behaviors are also quite distinct. For example, they do not practice mutual preening with one another. During courtship, males perform a simple display. The male waves his tail sideways and performs head bobbing. The female then reciprocates these movements to complete the interaction.

Scientists group rosellas into three main categories based on their cheek colors. The first group is the blue-cheeked species. This group includes the crimson rosella (Platycercus elegans) and the Green rosella (Platycercus caledonicus). The second group consists of the white-cheeked species. This includes P. eximius, P. adscitus, and P. venustus. The third group is the yellow-cheeked species, known as P. icterotis. These color differences are not just for show. Molecular studies in 1987 and 2015 have used DNA to confirm these different lineages.

Platycercus caledonicus -Tasmania -side-8
Platycercus caledonicus -Tasmania -side-8

Understanding the history of rosellas involves both early settlers and dedicated naturalists. Early European settlers in New South Wales encountered the eastern rosella at Rose Hill. Because of this location, they called it the Rosehill parrot. This name eventually evolved into the word "rosella." In 1825, the naturalist Nicholas Aylward Vigors formally described the genus Platycercus. He based his description on the unique architecture of the wing and tail feathers. He designated the crimson rosella as the type species for the entire genus.

Platycercus details in Gould Synopsis Birds Aust
Platycercus details in Gould Synopsis Birds Aust

Modern science uses DNA to solve mysteries about how these birds are related. For a long time, the relationships between rosellas and other parrots were unclear. Some researchers thought the Australian ringneck was their closest relative. Others suggested the genus Psephotus was more closely related. In 2015, Ashlee Shipham and colleagues used nuclear DNA to study these connections. Their research found that P. venustus and P. adscitus are sister species. This means they are very closely related on the evolutionary tree. Other studies in 2017 also helped clarify how different lineages split over time.

Rosellas have specific nesting habits that ensure the survival of their young. They are cavity nesters, which means they live in holes. They generally choose to nest high in large, old trees within forested areas. The female is responsible for incubating the eggs. This incubation period lasts for approximately 21 days. During this time, the male provides food for the female. He continues to feed her even after the eggs hatch. The chicks are born covered in white down. They typically take about five weeks to fledge, or grow feathers strong enough to fly.

In the world of aviculture, or bird keeping, rosellas are very popular. People enjoy them because they are colorful and can live for more than 20 years. They are also considered relatively easy to breed in captivity. However, keepers must be careful with their placement. Rosellas have a reputation for being aggressive toward other birds in cages. Therefore, it is recommended to keep them in separate enclosures. Their diet in captivity can include seeds and fruits like apples, pears, or grapes. They also eat vegetable matter such as silver beet, lettuce, and grass.

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File:Platycercus details in Gould Synopsis Birds Aust.jpg
Platycercus details in Gould Synopsis...
File:Platycercus caledonicus -Tasmania -side-8.jpg
Platycercus caledonicus -Tasmania -side-8.jpg
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