Тheropoda
Also known as Theropod, Theropods
thumb|alt=montage of four birds|In the modern fauna, theropods are represented by over 11,000 species of birds, which are a group of [[maniraptoran theropods within the clade Avialae.]]
AI overview
Theropoda is a group of dinosaurs that includes all modern birds, which represent over 11,000 living species today. This connection matters because it shows that birds are actually a type of theropod dinosaur that survived to the present day, making theropods one of the most successful animal groups in Earth's history.
AI-generated from the Wikipedia summary — may contain errors.
Species
獸腳亞目（学名：Theropoda）屬於蜥臀目，是群雙足恐龍。雖然牠們主要是肉食性動物，但是在白堊紀時期，一部份的獸腳類恐龍演變成為草食性、雜食性、甚至食蟲動物。獸腳類最早出現在三疊紀晚期的卡尼階，大約是2億3000萬年前。牠們從侏儸紀早期開始成為獨占廣大陸地的肉食動物，直到6500萬年前的白堊紀結束為止。獸腳亞目也是恐龍總目中唯一的肉食族群，其餘的鳥臀目所有恐龍、以及和獸腳亞目同為蜥臀目的蜥腳亞目都已經改為素食，但他們的祖先卻肉食素食都有。 獸腳亞目後來演變出一類特殊的小型恐龍，稱為虛骨龍類，虛骨龍經過幾千萬年的演化可能演變成了9,300個物種的鳥類的共同祖先。而目前已知最早的鳥類在侏儸紀晚期已經出現，例如始祖鳥，並且在恐龍還存活的白堊紀就已經有例如黃昏鳥和孔子鳥之類的現代鳥類生存了。獸腳亞目與鳥類之間的共同點包括：腳掌有三趾（牠們的第一趾其實萎縮在腳部後方）、胸部上的「叉骨」、與充滿空氣的骨頭。此外，某些獸腳類恐龍的手臂擁有羽毛（但不應具備飛行能力，例如恐爪龍和盜伶龍）和孵卵行為。
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Wikidata facts
- Image
- Dino bird h.jpg
~37 min read
Article
21 sectionsContents
- Biology
- Traits
- Diet and teeth
- Integument (skin, scales and feathers)
- Size
- Growth rates
- Stance and gait
- Nervous system and senses
- Forelimb morphology
- Forelimb movement
- Paleopathology
- Swimming
- Evolutionary history
- Classification
- History of classification
- Major groups
- Relationships
- Footnotes
- See also
- References
- External links
thumb|alt=montage of four birds|In the modern fauna, theropods are represented by over 11,000 species of birds, which are a group of [[maniraptoran theropods within the clade Avialae.]]
Theropoda (; from ancient Greek [wiktionary:θηρίον|, (therion) "wild beast"; wiktionary:πούς|, wiktionary:ποδός| (pous, podos) "foot"]) is one of the three major clades of dinosaur, alongside Ornithischia and Sauropodomorpha. Theropods, both extant and extinct, are characterized by hollow bones and three toes and claws on each limb. They are generally classed as a group of saurischian dinosaurs, placing them closer to sauropodomorphs than to ornithischians. They were ancestrally carnivorous, although a number of theropod groups evolved to become herbivores and omnivores. Members of the subgroup Coelurosauria were most likely all covered with feathers, and it is possible that they were also present in other theropods. In the Jurassic, birds evolved from small specialized coelurosaurian theropods, and are currently represented by about 11,000 living species, making theropods the only group of dinosaurs alive today.