carinate bird
Definition
Noun: A bird belonging to the group Carinatae, characterized by having a keeled sternum (breastbone). This keel provides a large surface area for the attachment of powerful flight muscles, enabling active, flapping flight. This group includes the vast majority of living bird species, from sparrows to eagles, but excludes flightless birds like ostriches which have a flat (ratite) breastbone.
Usage
The term is a formal, scientific classification. It is primarily used in ornithology, zoology, and evolutionary biology to categorize and discuss birds based on this specific anatomical feature related to flight capability.
Examples
- The eagle, a powerful carinate bird, relies on its well-developed pectoral muscles attached to its keeled sternum.
- In contrast to the ostrich, the pigeon is a typical carinate bird.
- The evolution of the keeled sternum was a key adaptation that defines carinate birds.
Advanced Usage
- The term is often used in contrast with ratite bird (a bird with a flat, raft-like sternum, such as an ostrich or emu).
- It can be used in discussions about avian evolution and the loss of flight, e.g., "Some flightless birds, like penguins, retain the keeled sternum of their carinate ancestors."
Variants and Related Words
- Carinate (adjective): Having a keel or ridge. Can describe the sternum itself (e.g., a carinate sternum) or, by extension, the birds that possess it.
- Carinatae (noun, plural): The formal taxonomic group or subclass that includes all carinate birds.
- Keel (noun): The prominent median ridge on the sternum of a bird or boat.
- Ratite (noun/adjective): Referring to birds with a flat, keel-less sternum.
Synonyms
- Flying bird (a functional, non-scientific synonym, though some carinate birds like penguins are flightless)
- Keel-breasted bird (a descriptive synonym)
Antonyms
- Ratite bird
- Flightless bird (a functional antonym, but note: some carinate birds like penguins are also flightless)
Noun
-
birds having keeled breastbones for attachment of flight muscles
Khám phá thêm
Các từ liên quan
Từ đồng nghĩa
Từ trái nghĩa
