biology

Long-trained nightjar

Long-trained nightjar is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Long-trained nightjar rather than just read about it. In short: The long-trained nightjar (Hydropsalis forcipata) is a species of nightjar in the family Caprimulgidae. It is found in Argentina and Brazil.

Key takeaways

Long-trained nightjar belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Long-trained nightjar to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Long-trained nightjar from memory before moving on to harder problems.

Reference excerpt

The long-trained nightjar (Hydropsalis forcipata) is a species of nightjar in the family Caprimulgidae. It is found in Argentina and Brazil.

Taxonomy and systematics Some authors have contended that the binomial Macropsalis creagra bestowed by Bonaparte in 1850 is correct, but consensus now is that the specific epithet forcipata has priority. The long-trained nightjar was formerly the only species placed in the genus Macropsalis. Based on the results of a 2023 molecular genetic study by Thiago Costa and collaborators, the species is now placed with three other species in the genus Hydropsalis that was introduced in 1832 by Johann Georg Wagler. The species is monotypic: no subspecies are recognised.

Description The male long-trained nightjar has extremely long outer tail feathers from which the species gets its name. It is 28 to 31 cm (11 to 12 in) long excluding those feathers, which are 48 to 68 cm (19 to 27 in) long. Both sex's upperparts are brown with spots and bars of grayish brown, tawny, buff, and cinnamon. The wings are similarly colored, with none of the white that others in family Caprimulgidae have. They have a broad tawny or tawny buff collar on the hindneck and a faint tawny patch on the throat. The breast is brown with tawny and buff bars and scallops, the belly and flanks buff with brown bars. The males elongated tail feathers have a broad white edge; the female's tail is darker and much shorter.

Distribution and habitat The long-trained nightjar is found in southeastern Brazil from Minas Gerais and Espírito Santo south to Rio Grande do Sul and into Argentina's far northeasternmost province, Misiones. It has been recorded as a vagrant in Paraguay. It inhabits the interior and edges of primary and secondary forest and woodland. In elevation it ranges from sea level to 1,800 m (5,900 ft), and higher in the north than the south.

Behavior

Feeding The long-trained nightjar has been recorded foraging by sallies from the ground, by hawking prey in flight, and by taking prey from leaves in flight. Its diet has not been detailed but is assumed to be insects.

Breeding The long-trained nightjar is thought to breed between November and January in most of its range. Males make a courtship display on the ground by raising their tail in a conspicuous white "V". Eggs are laid on the ground on leaf litter without a conventional nest; the site is often shaded by a bush. The female does most of the incubation.

Vocalization Both sexes of long-trained nightjar make "a repetitive, high-pitched 'tsip, tsip, tsip, tsip' call."

Status The IUCN originally assessed the long-trained nightjar as Threatened but since 2004 has rated it as being of Least Concern. It is variously rare, locally common, and common in different parts of its range.

References

Illustrations

Worked examples

Example 1 — a first encounter with Long-trained nightjar

Start with the simplest possible case. Write down what Long-trained nightjar claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Long-trained nightjar before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Long-trained nightjar ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Long-trained nightjar

In research: Long-trained nightjar appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Long-trained nightjar in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Long-trained nightjar is common in secondary-school and first-year university syllabi. It links to neighbouring topics Birds described in 1840, Birds of the Atlantic Forest, Hydropsalis, so understanding it makes those chapters shorter.
In everyday life: Look for Long-trained nightjar outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Long-trained nightjar in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Long-trained nightjar means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Long-trained nightjar out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Long-trained nightjar in simple terms?

The long-trained nightjar (Hydropsalis forcipata) is a species of nightjar in the family Caprimulgidae. It is found in Argentina and Brazil.

Why does Long-trained nightjar matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Long-trained nightjar?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Long-trained nightjar.