What is the key anatomical feature of a ratite?

A flat breastbone (sternum) lacking a keel, which prevents flight muscle attachment.

Are all flightless birds ratites?

No. Ratites are a specific taxonomic group. Penguins, for example, are flightless but have a keeled sternum and are not ratites.

What does 'ratite' literally mean?

It comes from Latin 'ratis', meaning 'raft', referring to the flat, raft-like sternum.

Where are ratites naturally found?

Different ratite species are native to Africa (ostriches), Australia (emus, cassowaries), New Zealand (kiwis), and South America (rheas).

ratite

UK/ˈrætaɪt/US/ˈræˌtaɪt/

Scientific, Academic

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Definition

Meaning

A flightless bird with a flat breastbone lacking a keel for muscle attachment.

A taxonomic group of large, flightless birds including ostriches, emus, rheas, cassowaries, and kiwis.

Linguistics

Semantic Notes

Strictly biological/zoological term referring to birds in the infraclass Palaeognathae characterized by their flat sternum.

Dialectal Variation

British vs American Usage

Differences

No significant differences in meaning or usage.

Connotations

Identical scientific/technical connotations in both varieties.

Frequency

Extremely rare outside specialized biological contexts in both regions.

Vocabulary

Collocations

strong

ratite birdsratite speciesratite evolution

medium

large ratitesextinct ratitesratite anatomy

weak

flightless ratitesmodern ratitesratite diversity

Grammar

Valency Patterns

ratite + noun (ratite bird)adjective + ratite (extinct ratite)preposition + ratite (among ratites)

Vocabulary

Synonyms

Neutral

flightless birds (broader)

Weak

palaeognathous birds (scientific)

Vocabulary

Antonyms

carinatekeel-breasted birdsflying birds

Usage

Context Usage

Academic

Used in biology, zoology, and paleontology to discuss avian evolution and classification.

Everyday

Almost never used in casual conversation.

Technical

Essential term in ornithology, vertebrate morphology, and taxonomic discussions.

Examples

By Part of Speech

adjective

British English

The ratite sternum lacks a keel.

American English

Ratite anatomy differs significantly from that of flying birds.

Examples

By CEFR Level

Ostriches and emus are examples of ratites.

The evolutionary divergence between ratites and carinate birds occurred millions of years ago.

Learning

Memory Aids

Mnemonic

Think: RATITES RUN – they're flightless birds with RAtite (rather flat) breastbones.

Conceptual Metaphor

Flatness equals flightlessness (structural metaphor).

Watch out

Common Pitfalls

Translation Traps (for Russian speakers)

Не переводить как 'крыса' (rat) – это ложный друг.
Правильно: 'бескилевые птицы' или 'ратиты'.

Common Mistakes

Misspelling as 'rattite' or 'ratate'.
Using it to refer to all flightless birds (penguins aren't ratites).

Practice

Quiz

Fill in the gap

Unlike most birds, a has a flat breastbone without a keel.

Multiple Choice

Which of these birds is NOT a ratite?

FAQ

Frequently Asked Questions

: A flat breastbone (sternum) lacking a keel, which prevents flight muscle attachment.
: No. Ratites are a specific taxonomic group. Penguins, for example, are flightless but have a keeled sternum and are not ratites.
: It comes from Latin 'ratis', meaning 'raft', referring to the flat, raft-like sternum.
: Different ratite species are native to Africa (ostriches), Australia (emus, cassowaries), New Zealand (kiwis), and South America (rheas).