biology

Kumimanu

Kumimanu 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 Kumimanu rather than just read about it. In short: Kumimanu is an extinct genus of giant penguin, which lived around 56 to 60 million years ago. The type species is Kumimanu biceae, which arose after the extinction of the non-avian dinosaurs.

Key takeaways

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

Reference excerpt

Kumimanu is an extinct genus of giant penguin, which lived around 56 to 60 million years ago. The type species is Kumimanu biceae, which arose after the extinction of the non-avian dinosaurs. Fossils were found in New Zealand, and the discovery was announced in December 2017. A second species, Kumimanu fordycei, was named in February 2023, though some researchers consider it synonymous with the type species.

Discovery and naming The Kumimanu fossil material were found by a group of researchers from the Hampden Beach of Otago, on the South Island of New Zealand. The fossils are from the Paleocene Waipara Greensand. The fossils were studied by a New Zealand and German team, led by Gerald Mayr of the Senckenberg Research Institute and Natural History Museum. He was the lead author of an article on the subject published online in December 2017. The generic name Kumimanu means "monster bird" in Māori language, while the specific name biceae honours Beatrice ("Bice") A. Tennyson who is the mother of one of the authors, Alan J. D. Tennyson. Kumimanu fordycei is named based on a large specimen from the late Palaeocene Moeraki Formation, dating to 55.5–59.5 million years ago. It was found by palaeontologist Alan Tennyson in 2017. The species name honours palaeontologist Ewan Fordyce. In their 2025 description and revision of fossil material from the New Zealand Waipara Greensand, Mayr et al. explained that the features used to distinguish K. fordycei from K. biceae fall within the range of variation of a single species in modern penguins and the coeval extinct genus Muriwaimanu. As such, they identified K. fordycei as a junior synonym of K. biceae, which was also supported by identical phylogenetic scorings for both species.

Description Kumimanu is one of the largest known penguins. K. biceae is estimated to have reached 177 cm (5 ft 10 in) in total length from the tip of the beak to tail, and weighed around 101 kg (223 lb). Its size is surpassed only by Palaeeudyptes, which reached a total length of up to 2 m (6 ft 7 in) and a body mass of 116 kg (256 lb). Kumimanu is older than all other previously found remains of penguins which reached 'giant' sizes, and thus allows scientists to better understand the evolution of penguins' size. Ksepka et al. (2023) described the second proposed species, K. fordycei as being significantly larger, with an estimated weight of 148–159.7 kg (326–352 lb). However, Mayr et al. (2025) claimed this size falls within the range of sizes exhibited by modern penguins.

References

Jadwiszczak, Piotr, et al. "Redescription Of Crossvallia Unienwillia: The Only Paleocene Antarctic Penguin." Ameghiniana, vol. 50, no. 6, 2013, pp. 545–553., doi:10.5710/amgh.09.10.2013.1058" "Ancient mega-penguin reached human height". Nature. 12 December 2017. pp. 295–295. doi:10.1038/d41586-017-08565-y. Malcolm Ritter: "Ancient penguin was as big as a (human) Pittsburgh Penguin", retrieved 15 December 2017. (Note: The title refers to the Pittsburgh Penguins ice hockey team).

Illustrations

Worked examples

Example 1 — a first encounter with Kumimanu

Start with the simplest possible case. Write down what Kumimanu 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 Kumimanu 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 Kumimanu 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 Kumimanu

In research: Kumimanu 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 Kumimanu 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: Kumimanu is common in secondary-school and first-year university syllabi. It links to neighbouring topics Extinct birds of New Zealand, Extinct penguins, Fossil taxa described in 2017, so understanding it makes those chapters shorter.
In everyday life: Look for Kumimanu 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 Kumimanu in 20 minutes

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

Frequently asked questions

What is Kumimanu in simple terms?

Kumimanu is an extinct genus of giant penguin, which lived around 56 to 60 million years ago. The type species is Kumimanu biceae, which arose after the extinction of the non-avian dinosaurs.

Why does Kumimanu 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 Kumimanu?

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 Kumimanu.