science

Gruae

Gruae is a science 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 Gruae rather than just read about it. In short: Gruae is a taxon of birds that contains the order Opisthocomiformes (hoatzin) and Gruimorphae (shorebirds and rails) identified in 2014 by genome analysis. Previous studies have placed the Hoatzin in different parts of the bird family tree; however, despite its unusual and primitive morphology, genetic studies have shown the hoatzin is not as primitive or as ancient as once thought, and that it could be a very deriv…

Key takeaways

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

Reference excerpt

Gruae is a taxon of birds that contains the order Opisthocomiformes (hoatzin) and Gruimorphae (shorebirds and rails) identified in 2014 by genome analysis. Previous studies have placed the Hoatzin in different parts of the bird family tree; however, despite its unusual and primitive morphology, genetic studies have shown the hoatzin is not as primitive or as ancient as once thought, and that it could be a very derived bird that reverted to or retains some plesiomorphic traits.

According to Suh et al. (2016), one of the problems with the conclusions about this novel clade is that independent studies (like Jarvis et al. 2014 and Prum et al. 2015) found very dissimilar phylogenetic relationships (like Inopinaves) using the same probabilistic support, such as bootstrap scores and Bayesian posterior probabilities.

See also Inopinaves for an alternative hypothesis on the placement of the Hoatzin

References

Illustrations

Worked examples

Example 1 — a first encounter with Gruae

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

In research: Gruae appears in science 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 Gruae 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: Gruae is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bird stubs, Extant Campanian first appearances, Neognathae, so understanding it makes those chapters shorter.
In everyday life: Look for Gruae 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Gruae in 20 minutes

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

Frequently asked questions

What is Gruae in simple terms?

Why does Gruae matter?

Because it connects several science 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 Gruae?

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 Gruae.