biology

Laysan finch

Laysan finch 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 Laysan finch rather than just read about it. In short: The Laysan finch (Telespiza cantans), sometimes referred to by its Hawaiian name, ʻekupuʻu, is a species of Hawaiian honeycreeper, that is endemic to the Northwestern Hawaiian Islands. It is one of four remaining finch-billed Hawaiian honeycreepers and is closely related to the smaller Nihoa finch.

Key takeaways

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

Reference excerpt

The Laysan finch (Telespiza cantans), sometimes referred to by its Hawaiian name, ʻekupuʻu, is a species of Hawaiian honeycreeper, that is endemic to the Northwestern Hawaiian Islands. It is one of four remaining finch-billed Hawaiian honeycreepers and is closely related to the smaller Nihoa finch. The Laysan finch is named for Laysan, the island to which it was endemic on its discovery. It was subsequently introduced to a few other atolls, and its historical range included some of the main islands.

Description The Laysan finch is a large honeycreeper with a heavy bill. Overall the male has yellow plumage with a whitish belly and a grey neck. The female is duller than the male, with brown streaking. It is almost impossible to confuse the Laysan finch with any other bird in the field as it is the only passerine species found on the few islands it lives on.

Range and behavior

Range On its discovery, the Laysan finch was an endemic resident of the small island of Laysan, along with the Laysan rail (Porzana palmeri), the Laysan honeycreeper (Himatione fraithii), the Laysan duck (Anas laysanensis), and the Laysan millerbird (Acrocephalus familiaris familiaris). Populations were introduced to several islands, including Pearl and Hermes Atoll, where the species persists, and Midway Atoll, where it survived until the introduction of rats. The fossil record shows that the finch once had a greater range in Hawaiʻi, reaching as far as Oʻahu, and that birds on Laysan represent a relict population.

Behavior The Laysan finch nests in vegetation, laying three eggs in a cup-shaped nest. These are incubated for 16 days by the female, the male in turn feeding the female. The chicks fledge after three weeks and are cared for by the parents for another three weeks. The Laysan finch is a generalist, feeding on seeds, small insects, fruit, carrion (of seabirds and Hawaiian monk seals), and the eggs of nesting seabirds. While unable to break into the eggs of the larger seabirds (such as albatross and boobies) they will scavenge from them. They actively take the eggs of smaller seabirds such as those of white tern (Gygis alba) and the endemic Laysan duck (Anas laysanensis).

Conservation The Laysan finch is listed as Vulnerable by the IUCN because of its highly restricted range and vulnerability to extremes of weather, and it is considered endangered by the State of Hawaiʻi and U.S. government. It survived the devastating effects of the introduction of domestic rabbits on Laysan Island (unlike the Laysan millerbird, honeycreeper and rail) by taking carrion and seabird eggs. However, this caused their population to shrink to fewer than 100 individuals and the bottleneck caused a reduction in genetic diversity that may have put the species at increased risk of extinction. The birds also suffered a loss of heterozygosity following founding events on other islands which may have caused an accumulation of deleterious recessive alleles in the populations. Laysan is now part of the Hawaiian Islands National Wildlife Refuge. The population is considered stable with the biggest threat being uncontrollable climate change.

Gallery

See also Climate change Conservation biology Founder effect Genetic diversity List of threatened birds of the United States List of vulnerable birds Population bottleneck

References

Morin, M. P., and S. Conant. 2002. Laysan Finch (Telespiza cantans) and Nihoa Finch (Telespiza ultima). In The Birds of North America, No. 639 (A. Poole and F. Gill, eds.). The Birds of North America, Inc., Philadelphia, PA.

External links

BirdLife Species Factsheet

Illustrations

Worked examples

Example 1 — a first encounter with Laysan finch

Start with the simplest possible case. Write down what Laysan finch 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 Laysan finch 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 Laysan finch 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 Laysan finch

In research: Laysan finch 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 Laysan finch 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: Laysan finch is common in secondary-school and first-year university syllabi. It links to neighbouring topics Birds described in 1890, ESA endangered species, Endemic birds of Hawaii, so understanding it makes those chapters shorter.
In everyday life: Look for Laysan finch 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Laysan finch” →

Affiliate

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

How to study Laysan finch in 20 minutes

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

Frequently asked questions

What is Laysan finch in simple terms?

Why does Laysan finch 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 Laysan finch?

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 Laysan finch.