science

Struthio anderssoni

Struthio anderssoni 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 Struthio anderssoni rather than just read about it. In short: Struthio anderssoni, also known as the East Asian ostrich, is a large extinct species of ostrich that lived in the Pleistocene and Holocene in China, Mongolia and Russia. It was much larger than extant ostriches, with estimated mass of 250–270 kg (550–600 lb).

Key takeaways

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

Reference excerpt

Struthio anderssoni, also known as the East Asian ostrich, is a large extinct species of ostrich that lived in the Pleistocene and Holocene in China, Mongolia and Russia. It was much larger than extant ostriches, with estimated mass of 250–270 kg (550–600 lb).

Taxonomy In 2023, based on a re-examination of cast of a femur, Éric Buffetaut suggested that this species be moved to the genus Pachystruthio, noting that the main differences are in size and not morphology between the femur of Pachystruthio and that of S. anderssoni. Mikhailov and Zelenkov suggested this species is a larger bodied form of extant ostriches. Buffetaut disagreed with this hypothesis, noting the significantly larger size and differing morphological features, including the minimum shaft width/total length ratio of the femur.

Description Buffetaut and Angst conclude that Struthio anderssoni was significantly larger than the modern ostrich, with both eggs and skeletal remains indicating this.

Femur The femur of one specimen from Upper Cave at Zhoukoudian measures 355 mm in length (within the estimated range of 304 – 371 mm for the species) and 69 mm in minimum shaft width. A 187 mm minimum shaft circumference on a cast from this species gives a mass estimate of 258 kg (569 lb). Another partial femur has a minimum shaft circumference of 190 mm, which gives it a mass estimate of 269 kg (593 lb).

Eggs In 1933, three nearly complete eggs were measured to be 17.5–19.3 cm (6.9–7.6 in) in length and 14.4–15.5 cm (5.7–6.1 in) in width. Slightly differing size ranges from Lowe (1931) were calculated in a 2025 article to correspond to 1.89–2.8 kg (4.2–6.2 lb) in mass. Buffetaut and Angst had earlier calculated a marginally smaller egg mass, being 1.7–2.6 kg (3.7–5.7 lb). Despite their larger size, the eggs are not significantly thicker than those of modern ostriches, being 2.1–2.3 mm in shell thickness. A mass estimate based on the eggs results in 176–350 kg (388–772 lb), with a mean of 263 kg (580 lb).

Paleobiology and extinction The large body and egg size of S. anderssoni may be an adaptation for a cold climate, in which this species was more cold tolerant than African ostriches (although this is not the sole explanation, due to the existence of large ostriches in warmer climates), but both being well suited for arid environments. They may have had similar internal physiology to African ostriches, due to similarity in egg morphology. The youngest dates obtained by mass spectrometry analysis of eggshell fragments reveal that the species survived until at least 8.9 ka BP.

See Also Struthio oldawayi Struthio wimani

References

Illustrations

Worked examples

Example 1 — a first encounter with Struthio anderssoni

Start with the simplest possible case. Write down what Struthio anderssoni 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 Struthio anderssoni 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 Struthio anderssoni 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 Struthio anderssoni

In research: Struthio anderssoni 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 Struthio anderssoni 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: Struthio anderssoni is common in secondary-school and first-year university syllabi. It links to neighbouring topics Extinct birds of Asia, Extinct flightless birds, Fossil taxa described in 1931, so understanding it makes those chapters shorter.
In everyday life: Look for Struthio anderssoni 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 Struthio anderssoni in 20 minutes

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

Frequently asked questions

What is Struthio anderssoni in simple terms?

Why does Struthio anderssoni 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 Struthio anderssoni?

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 Struthio anderssoni.