biology

Saint Helena crake

Saint Helena crake 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 Saint Helena crake rather than just read about it. In short: The Saint Helena crake (Zapornia astrictocarpus) is an extinct bird species from the island of Saint Helena in the South Atlantic Ocean, one of two flightless rails which survived there until the early 16th century. After American ornithologist Alexander Wetmore described bones of the large Saint Helena rail (Aphanocrex podarces) from Prosperous Bay, Saint Helena, in 1963, American paleontologist Storrs Olson found…

Key takeaways

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

Reference excerpt

The Saint Helena crake (Zapornia astrictocarpus) is an extinct bird species from the island of Saint Helena in the South Atlantic Ocean, one of two flightless rails which survived there until the early 16th century. After American ornithologist Alexander Wetmore described bones of the large Saint Helena rail (Aphanocrex podarces) from Prosperous Bay, Saint Helena, in 1963, American paleontologist Storrs Olson found almost complete skeletons of the Saint Helena crake in the same region in 1973. These skeletons consist of bones which were smaller than the bones of Aphanocrex podarces. Due to the peculiar shape of the carpometacarpus Olson named this species Porzana astrictocarpus. Olson proceeded on the assumption that the Saint Helena crake was a derivative of the Baillon's crake (Zapornia pusilla), which is widespread in Europe and Africa. As there were no predators on Saint Helena, it had lost its ability to fly. However, when Saint Helena was colonised around 1502, the settlers brought a lot of mammals to the island, leading to the out-competition and eventual extinction of the Saint Helena crake.

References

Illustrations

Worked examples

Example 1 — a first encounter with Saint Helena crake

Start with the simplest possible case. Write down what Saint Helena crake 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 Saint Helena crake 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 Saint Helena crake 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 Saint Helena crake

In research: Saint Helena crake 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 Saint Helena crake 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: Saint Helena crake is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bird extinctions since 1500, Birds described in 1973, Birds of Saint Helena Island, so understanding it makes those chapters shorter.
In everyday life: Look for Saint Helena crake 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 Saint Helena crake in 20 minutes

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

Frequently asked questions

What is Saint Helena crake in simple terms?

Why does Saint Helena crake 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 Saint Helena crake?

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 Saint Helena crake.