biology

Large-billed tern

Large-billed tern 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 Large-billed tern rather than just read about it. In short: The large-billed tern (Phaetusa simplex) is a species of tern in the family Laridae. It is placed the monotypic genus Phaetusa.

Key takeaways

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

Reference excerpt

The large-billed tern (Phaetusa simplex) is a species of tern in the family Laridae. It is placed the monotypic genus Phaetusa. It is found in most of South America (east of the Andes and north of the Pampas). It has occurred as a vagrant in Aruba, Bermuda, Cuba, Panama and the United States. Its natural habitats are rivers and freshwater lakes.

Taxonomy The large-billed tern was formally described in 1789 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's Systema Naturae. He placed it with the other terns in the genus Sterna and coined the binomial name Sterna simplex. Gmelin based his description on the "simple tern" that had been described in 1785 by the English ornithologist John Latham in his book A General Synopsis of Birds from a specimen that had been collected in Cayenne, French Guiana. The large-billed tern is now the only species placed in the genus Phaetusa that was introduced for the species in 1832 by the German naturalist Johann Georg Wagler. The genus name comes from Greek mythology. Phaetusa (or Heliades) was sister to Phaethon and one of the daughters of Phoebus (Helios) and Clymene. The specific epithet simplex is Latin meaning "simple" or "plain". The species is monotypic: no subspecies are recognised.

Description The large-billed tern is large, short-tailed tern with a large yellow bill. It is around 38 cm (15 in) in overall length and weighs 208–247 g (7.3–8.7 oz). The crown and ear-coverts are black, the upperparts are grey, the secondaries, primary coverts, lores and underparts are white. The legs and feet are yellow. A non-breeding adult has a paler crown and forehead.

Gallery

References

Illustrations

Worked examples

Example 1 — a first encounter with Large-billed tern

Start with the simplest possible case. Write down what Large-billed tern 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 Large-billed tern 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 Large-billed tern 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 Large-billed tern

In research: Large-billed tern 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 Large-billed tern 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: Large-billed tern is common in secondary-school and first-year university syllabi. It links to neighbouring topics Birds described in 1789, Birds of South America, Charadriiformes stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Large-billed tern 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 Large-billed tern in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Large-billed tern 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 Large-billed tern out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Large-billed tern in simple terms?

The large-billed tern (Phaetusa simplex) is a species of tern in the family Laridae. It is placed the monotypic genus Phaetusa.

Why does Large-billed tern 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 Large-billed tern?

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 Large-billed tern.