biology

Giant coot

Giant 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 Giant coot rather than just read about it. In short: The giant coot (Fulica gigantea) is a species of bird in subfamily Rallinae of family Rallidae, the rails, gallinules, and coots. It is found in Argentina, Bolivia, Chile, and Peru.

Key takeaways

Giant 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 Giant coot to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Giant coot from memory before moving on to harder problems.

Reference excerpt

The giant coot (Fulica gigantea) is a species of bird in subfamily Rallinae of family Rallidae, the rails, gallinules, and coots. It is found in Argentina, Bolivia, Chile, and Peru.

Taxonomy and systematics The giant coot is monotypic.

Description The giant coot is the second largest extant member of family Rallidae, after the takahē of New Zealand. Adults are 48 to 59 cm (19 to 23 in) long. They weigh about 2,000 to 2,500 g (4.4 to 5.5 lb) and are too heavy to fly, though immature birds are smaller and readily fly. The sexes are alike. Adults have a bulky body and a disproportionately small head. Their plumage is deep slaty gray that is blacker on the head and neck. Their undertail coverts have some white streaking. Their bill is deep red with some yellow at the base of the maxilla, their frontal shield is yellow, and unique among coots their legs and feet are deep red. Immature birds have dark gray underparts and a paler bill and legs than adults. Juveniles are dark dull gray with some white on the face and dusky legs.

Distribution and habitat The giant coot is found from southern Peru through western Bolivia into northern Chile and northwestern Argentina. It is a bird of the Altiplano, a generally barren high elevation landscape. There it inhabits ponds and lakes, especially those with weedy shallows. It mainly occurs between 3,600 and 5,000 m (11,800 and 16,400 ft) but is regular as high as 6,540 m (21,500 ft) and occasionally wanders as far as the Pacific coast.

Behavior

Movement Giant coot adults are generally sedentary though they may walk to open water if a small pond freezes. Immature birds disperse by flying at night.

Feeding The giant coot feeds mostly on aquatic vegetation, especially plants of genera Myriophyllum, Potamogeton, Zannichellia, and Ruppia. It also eats algae but shuns Chara. It feeds mostly at the water surface but occasionally dabbles like a duck or dives; it also grazes on shore.

Breeding The giant coot breeds at any season, but its peak egg-laying period is the local winter of June and July. The species is monogamous and very territorial. It makes a huge nest of plant material dredged and piled up in water about 1 m (3 ft) deep. Newish nests float but as nesting progresses and both members of the pair add material it usually ends up resting on the bottom. The clutch size is three to seven eggs and both parents incubate them. Young feed on fresh vegetation added to the nest and also on plants and small animal prey such as amphipods and tadpoles brought by the parents.

Vocalization Male giant coots make "alternating gobbling or laughing 'houehouhouhouhoou' and low, growling 'hrr' or 'horr' sounds". Females make "low, crackling 'chee-jrrrh' [and] low squeaking or cracking sounds"; when with a male they also make a "soft 'hi-hirr hirrr hirrr...'".

Status The IUCN has assessed the giant coot as being of Least Concern. It has a large range and its estimated population of up to 67,000 mature individuals is believed to be stable. No immediate threats have been identified. Though it is generally scarce in much of its range, some areas have large populations, and the populations in Chile and Peru have increased due to controls on firearms.

Gallery

References

Illustrations

Worked examples

Example 1 — a first encounter with Giant coot

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

In research: Giant 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 Giant 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: Giant coot is common in secondary-school and first-year university syllabi. It links to neighbouring topics Birds described in 1841, Birds of the Altiplano, Coots, so understanding it makes those chapters shorter.
In everyday life: Look for Giant 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 Giant coot in 20 minutes

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

Frequently asked questions

What is Giant coot in simple terms?

The giant coot (Fulica gigantea) is a species of bird in subfamily Rallinae of family Rallidae, the rails, gallinules, and coots. It is found in Argentina, Bolivia, Chile, and Peru.

Why does Giant 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 Giant 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 Giant coot.