biology

Supercilium

Supercilium 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 Supercilium rather than just read about it. In short: The supercilium is a plumage feature found on the heads of some bird species. It is a stripe that runs from the base of the bird's beak above its eye, finishing somewhere towards the rear of the bird's head.

Key takeaways

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

Reference excerpt

The supercilium is a plumage feature found on the heads of some bird species. It is a stripe that runs from the base of the bird's beak above its eye, finishing somewhere towards the rear of the bird's head. Also known as an "eyebrow", it is distinct from the eyestripe, which is a line that runs across the lores, and continues behind the eye. Where a stripe is present only above the lores, and does not continue behind the eye, it is called a supraloral stripe or simply supraloral. On most species that display a supercilium, it is paler than the adjacent feather tracts. The colour, shape, or other features of the supercilium can be useful in bird identification. For example, the supercilium of the dusky warbler, an Old World warbler species, can be used to distinguish it from the very similar Radde's warbler. The dusky warbler's supercilium is sharply demarcated, whitish, and narrow in front of the eye, becoming broader and more buffy towards the rear, whereas that of the Radde's warbler is diffusely defined, yellowish, and broadest in front of the eye, becoming narrower and more whitish toward the rear. The supercilium of the northern waterthrush, a New World warbler, differs subtly from that of the closely related (and similarly plumaged) Louisiana waterthrush. The Louisiana has a bicoloured supercilium, which widens significantly behind the eye, while the northern has an evenly buffy eyebrow, which is either the same width throughout or slightly narrower behind the eye. A split supercilium divides above the lores. In some species, such as the jack snipe, the divided stripes reconnect again behind the eye. In others, such as the broad-billed sandpiper, the divided stripes remain separate. A supercilium drop is a feature found on some pipits; it is a pale spot on the rear of the ear coverts, which although separated from the supercilium by an eyestripe, can appear at some angles to be a downward continuation of the supercilium.

Gallery

References

Illustrations

Worked examples

Example 1 — a first encounter with Supercilium

Start with the simplest possible case. Write down what Supercilium 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 Supercilium 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 Supercilium 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 Supercilium

In research: Supercilium 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 Supercilium 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: Supercilium is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bird anatomy, Feathers, so understanding it makes those chapters shorter.
In everyday life: Look for Supercilium 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 Supercilium in 20 minutes

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

Frequently asked questions

What is Supercilium in simple terms?

Why does Supercilium 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 Supercilium?

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 Supercilium.