biology

Horned coot

Horned coot 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 Horned coot rather than just read about it. In short: The horned coot (Fulica cornuta) is a species of bird found in the Andes of South America. It was described by Bonaparte in 1853 based on a specimen collected in Bolivia.

Key takeaways

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

Reference excerpt

The horned coot (Fulica cornuta) is a species of bird found in the Andes of South America. It was described by Bonaparte in 1853 based on a specimen collected in Bolivia. For a long time it was known only from the type specimen.

Description Horned coot males average a little larger than the female. With a total length of 46–62 cm (18–24 in) and a reported body mass from 1.6–2.29 kg (3.5–5.0 lb), it averages slightly smaller than the related giant coot as the second largest coot and the third largest extant species of rail. While most coots have a horny shield on the forehead, the horned coot has three wattles in both sexes. The central wattle is large and may possibly be erectile. The three wattles terminate in tufts of filoplumes. At the base of the beak and below the wattle is a fleshy caruncle which is whitish. The bill is olive yellow, brightening to dull orange towards the base. Unlike the giant coot, the legs of the horned coot are dull greenish.

Breeding

The horned coot is monogamous, and sometimes breeds in colonies of up to 80 pairs. The huge nest is typically located about 40 metres from the shore in the waters of the high altitude lakes where it breeds. Pebbles are piled by the birds to form an artificial island that reaches the water surface. This island is then covered with algae to form the nest. It has been estimated that the pebble mounds may weigh as much as 1.5 tons and they are refurbished in each season. They breed from November to January.

Distribution and habitat The coot occurs in the altiplano of north-western Argentina, south-western Bolivia, and north-eastern Chile. A single vagrant has been recorded in southern Peru. It is almost entirely restricted to lakes at altitudes of 3000–5200 m.a.s.l., but has occasionally been recorded at lower altitudes.

Status and conservation It is generally a low-density species; total population has been estimated at 5,000–25,000 mature individuals as of 2025. The Chilean sub-population is estimated to contain approximately 620 individuals. Consequently, it is considered to be near threatened by BirdLife International and IUCN.

References

External links

Photos and call 3D specimen

Illustrations

Worked examples

Example 1 — a first encounter with Horned coot

Start with the simplest possible case. Write down what Horned coot 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 Horned coot 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 Horned coot 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 Horned coot

In research: Horned coot 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 Horned coot 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: Horned coot is common in secondary-school and first-year university syllabi. It links to neighbouring topics Birds described in 1853, Birds of Argentina, Birds of Chile, so understanding it makes those chapters shorter.
In everyday life: Look for Horned coot 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 Horned coot in 20 minutes

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

Frequently asked questions

What is Horned coot in simple terms?

The horned coot (Fulica cornuta) is a species of bird found in the Andes of South America. It was described by Bonaparte in 1853 based on a specimen collected in Bolivia.

Why does Horned coot 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 Horned coot?

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 Horned coot.