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Nightjar

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Nightjars are medium-sized birds belonging to the family Caprimulgidae. They are most notable for being nocturnal or crepuscular. This means they are active during the night or at twilight. They are found on every continent except for Antarctica. Some specific groups live on islands like the Seychelles or New Caledonia. These birds play a vital role in their ecosystems by eating insects. Because of this, they are sometimes called "bugeaters."

Madagascar Nightjar - Tulear - Madagascar S4E8596 (15289655575)
Madagascar Nightjar - Tulear - Madagascar S4E8596 (15289655575)

The physical design of a nightjar is perfectly suited for its lifestyle. They possess long, pointed wings that allow for efficient flight. Their legs are very short, making them poorly suited for walking. Most species have very small bills, but they possess rictal bristles. These bristles are hair-like feathers located near the mouth. Their plumage is often patterned to help them hide during the day. However, they may also have pale spots used for intraspecific communication. This is a way birds communicate with members of their own species.

Nightjars inhabit a massive variety of environments. They can live at almost any elevation, from sea level to high mountains. Some species are montane specialists, meaning they live specifically in mountain habitats. While they can live in rainforests or even deserts, they prefer open country with some vegetation. They are not known to live in extremely dry, arid desert regions. Many species are migratory, moving to follow food or warmer weather. For example, European nightjars in southern England migrate to the Democratic Republic of the Congo for the winter.

Madagascar Nightjar - Tulear - Madagascar S4E8596 (15289655575)
Madagascar Nightjar - Tulear - Madagascar S4E8596 (15289655575)

The scientific classification of nightjars has changed over time. In 2021, the International Ornithological Congress redefined the order Caprimulgiformes. Previously, this order included many other birds like potoos and frogmouths. Now, Caprimulgiformes applies only to nightjars. Other birds like oilbirds and owlet-nightjars have been moved to their own orders. Scientists use phylogenetic analysis to study these relationships. This method looks at evolutionary history. For instance, researchers found that the extinct Archaeotrogonidae family is the closest known relative to modern nightjars.

Madagascar Nightjar - Tulear - Madagascar S4E8596 (15289655575)
Madagascar Nightjar - Tulear - Madagascar S4E8596 (15289655575)

The family Caprimulgidae is very large and diverse. It contains 22 different genera, which are groups of closely related species. The largest genus is Caprimulgus, which includes 39 different species. This group includes the European nightjar. Another important group is the Chordeiles, which includes the common nighthawk. One very unique member is the common poorwill, or Phalaenoptilus nuttallii. This bird can undergo a form of hibernation. It enters a state called torpor, where its body temperature drops significantly. This state can last for weeks or even months.

Madagascar Nightjar - Tulear - Madagascar S4E8596 (15289655575)
Madagascar Nightjar - Tulear - Madagascar S4E8596 (15289655575)

Conservation is a significant challenge for many nightjar species. Because they are secretive, it is often hard for scientists to count them. The Vaurie's nightjar in China is a prime example. It is so rare that it has only been seen once in hand. Scientists struggle to know if such birds are endangered or extinct. Another danger is mortality from cars. Many nightjars have a habit of resting or roosting on roads. This makes them vulnerable to being hit by vehicles. Additionally, they usually nest on the bare ground, which leaves their eggs exposed.

Madagascar Nightjar - Tulear - Madagascar S4E8596 (15289655575)
Madagascar Nightjar - Tulear - Madagascar S4E8596 (15289655575)

Nightjars have also left an imprint on human culture. In the United States, the name "nighthawk" has been used for many things. The state of Nebraska was once known as the "Bugeater State." Its people and its college athletic teams were also called Bugeaters. In music, the nightjar appears in the lyrics of the song "Come Down in Time" by Elton John and Bernie Taupin. Musician Cosmo Sheldrake even featured their calls in his album "Wake up Calls." He used the nightjar's call to represent the end of the night.

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