chemistry

Highland guan

Highland guan is a chemistry 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 Highland guan rather than just read about it. In short: The highland guan (Penelopina nigra) is a species of bird in the family Cracidae. It is found in the highlands of El Salvador, Guatemala, Honduras, southern Mexico, and Nicaragua.

Key takeaways

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

Reference excerpt

The highland guan (Penelopina nigra) is a species of bird in the family Cracidae. It is found in the highlands of El Salvador, Guatemala, Honduras, southern Mexico, and Nicaragua. Its natural habitat is subtropical or tropical moist montane forest. Its population has declined much in recent times: Listed as a species of Least Concern in 1994, it was uplisted to Near Threatened in 2000 and, as it was determined to be less common than previously believed, to Vulnerable in the 2007 IUCN Red List.

Description

The highland guan grows to a length of 590 to 650 millimetres (23 to 26 in). The plumage of the male is black, the upper parts glossed with green or blue, the underparts rather duller. The iris of the eye is reddish-brown and there is reddish-brown or purplish bare skin around and behind the eye. The beak, the bare skin on the throat, the large wattle, the legs and feet are reddish-orange. The female, by contrast, is black, heavily mottled and barred with reddish-brown and cinnamon, with a red beak and bare skin round the beak, and purplish bare skin round the eye.

Taxonomy The three syntype specimens of Penelope niger Fraser (Proc. Zool. Soc. London, 1850 (1852), p.246, pl.XXIX.) are held in the collections of National Museums Liverpool at World Museum, with accession numbers D484 (male adult) and D484a (female adult) and D484b (male adult). The specimens came to the Liverpool national collection via the 13th Earl of Derby's collection which was bequeathed to the people of Liverpool in 1851. D484 and D484a were purchased from Mess. Leadbeater in September 1843 while D484b died at the menagerie at Knowsley Hall on 5 August 1850.

Distribution and habitat The highland guan is found on either side of the mountain ranges in Central America. In Mexico it is uncommon, but it is present in moderate numbers in the El Triunfo Biosphere Reserve. It is also common in some localities in Guatemala, but rather rarer in Honduras, north-central Nicaragua and El Salvador, and it may be extinct in El Salvador. Its habitat is humid broad-leaved mountain forests, mainly cloud forests and pine-oak forests, but it has also been observed in secondary forests and plantations. The bird forages for fruit, in the trees and on the leaf litter.

Status The highland guan is thought to be decreasing in numbers. The main threats it faces are the destruction of its forest habitat, and being hunted for food. The International Union for Conservation of Nature has assessed its conservation status as "vulnerable".

References

BirdLife International (2007a): [ 2006-2007 Red List status changes ]. Retrieved 26 August 2007. BirdLife International (2007b): Highland Guan - BirdLife Species Factsheet. Retrieved 26 August 2007.

Illustrations

Worked examples

Example 1 — a first encounter with Highland guan

Start with the simplest possible case. Write down what Highland guan claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, 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 Highland guan 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 Highland guan 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 Highland guan

In research: Highland guan appears in chemistry 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 Highland guan 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: Highland guan is common in secondary-school and first-year university syllabi. It links to neighbouring topics Birds described in 1852, Birds of Guatemala, Birds of Honduras, so understanding it makes those chapters shorter.
In everyday life: Look for Highland guan 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 Highland guan in 20 minutes

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

Frequently asked questions

What is Highland guan in simple terms?

The highland guan (Penelopina nigra) is a species of bird in the family Cracidae. It is found in the highlands of El Salvador, Guatemala, Honduras, southern Mexico, and Nicaragua.

Why does Highland guan matter?

Because it connects several chemistry 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 Highland guan?

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 Highland guan.