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Locustellidae

life science Maturity 7-9 Next article →

Locustellidae is a family of small, insectivorous songbirds. These birds are often called warblers. They belong to a large group called the Sylvioidea superfamily. For a long time, scientists placed them in a "wastebin" family of Old World warblers. This means they were grouped with many other birds that were not closely related. Now, they are recognized as their own distinct family. This family includes grasshopper warblers, grassbirds, and bush warblers known as Bradypterus. They are found mainly in Africa, Eurasia, and the Australian region.

Many species in this family have very specific physical traits. They are often drab in color, appearing brownish or buffy. Most have long and pointed tails. The genus Megalurus actually means "the large-tailed one" in English. Some birds in this group are larger and slimmer than the Cettia shrub-warblers. Many also show bold, dark streaks on their wings or their undersides. These birds are among the most terrestrial of the warblers. This means they spend much of their time on or near the ground. They often hunt for food by clambering through thick, tangled scrubland or chasing insects on the floor.

One fascinating biological trait involves their movement. While most songbirds in the order Passeriformes fly well, some taxa show something unusual. They show the beginning of an evolution towards flightlessness. This is a rare development for this group of birds. Their behavior in thick growth also defines them. They prefer to live in scrubland where they can hide and hunt. This lifestyle makes them very different from birds that stay high in the tree canopy.

Our understanding of these birds changed through scientific discovery. The name Locustellidae comes from the type genus, Locustella. This name is a Latin diminutive of locusta, which means "grasshopper." This name describes the song of many species. For example, the common grasshopper warbler, Locustella naevia, has a song that sounds like a grasshopper. Another name, Megaluridae, is sometimes used for the family. However, Locustellidae is the name that has priority in scientific naming.

In 2018, a major study changed how we classify these birds. Per Alström and his coworkers conducted a molecular phylogenetic study. This type of study looks at DNA to find true evolutionary relationships. The study found that many of the existing genera were non-monophyletic. This means the groups did not all share a single common ancestor. Because of this, scientists had to revise the taxonomy, or the naming system. They resurrected the genus Poodytes and the genus Cincloramphus. They also described a brand new genus called Helopsaltes. Some older names, like Megalurulus and Buettikoferella, became junior synonyms of Cincloramphus.

The family currently contains 67 different species. These species are divided into 11 distinct genera. The largest group is Locustella, which contains 23 species of grasshopper warblers. The Cincloramphus genus follows with 12 species. The Bradypterus genus, which includes megalurid bush warblers, also has 12 species. Other groups include Helopsaltes with 6 species and Poodytes with 5 species. Some groups are much smaller, such as Schoenicola, which has only 2 species. Other genera include Robsonius, Elaphrornis, Malia, Megalurus, and Catriscus.

Locustellidae is closely connected to other bird families through evolution. They are closest to the Malagasy warblers. This is another recently recognized family. Interestingly, the black-capped donacobius is also a relative. It lives in South America and comes from the same ancestral stock. Scientists used to believe it was a wren, but they now know it is related to this group. This shows how DNA studies help us correct old mistakes about how animals are related across the world.

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