英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字，中文词皆可：


请选择你想看的字典辞典：
单词字典翻译
Ratitae查看　Ratitae　在百度字典中的解释百度英翻中〔查看〕
Ratitae查看　Ratitae　在Google字典中的解释Google英翻中〔查看〕
Ratitae查看　Ratitae　在Yahoo字典中的解释Yahoo英翻中〔查看〕

安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • Ratite - Wikipedia
    Ratites ( ˈrætaɪts ) are a polyphyletic group consisting of all birds within the infraclass Palaeognathae that lack keels and cannot fly [3] They are mostly large, long-necked, and long-legged, the exception being the kiwi, which is also the only nocturnal extant ratite
  • Ratite | Flightless, Ostriches, Emus | Britannica
    ratite, any bird whose sternum (breastbone) is smooth, or raftlike, because it lacks a keel to which flight muscles could be anchored All species of ratites are thus unable to fly They are a peculiar and puzzling group, with anatomic anomalies
  • Ratites (Struthioniformes) Information - Earth Life
    Ratites in general share many physical characteristics, with the exception of the Family Tinamidae, or Tinamous First, the breast-muscles are under-developed They do not have a keeled sternum Their wishbone (furcula) is almost absent They have a simplified wing skeleton, and wing musculature
  • Ratites or Struthioniformes - PubMed Central (PMC)
    Ratite is not a strict taxonomic term; it is used to refer to flightless birds that do not have a keel but have, rather, a flat “raft-like” breast 2, 19 In general, ratites are classified in one order, Struthioniformes, with four suborders with distinct geographic distributions: (1) Struthiones are endemic to the African continent (apart from i
  • What are the 5 examples of ratites? - Birdful
    Ratites are a group of large, flightless birds that includes ostriches, emus, rheas, cassowaries, and kiwis They are distinguished by their flat breastbones and lack of a keel, which prevents them from being able to fly Despite their inability to fly, ratites are very quick on their feet and can run at high speeds using their powerful legs
  • Ratite - Simple English Wikipedia, the free encyclopedia
    Therefore, ratites are a group of medium to large birds, most of whom are flightless, with the exception of the tinamous The ratites evolved flightlessness more than once The similarities between ostriches and the Australo-Pacific ratites is due to convergent evolution
  • Ratite - New World Encyclopedia
    Ratite is the common name for any of a group of flightless birds characterized by a flat, raft-like sternum (breastbone) lacking the keel for attachment of wing muscles that is typical of most flying birds and some other flightless birds The name ratite comes from the Latin word for raft (ratis), because their breastbone looks like a raft
  • Ratites - Animal Corner
    Ratites are a group of flightless birds that include the ostrich, emu, cassowary, and rhea They are all native to the Southern Hemisphere and have characteristic flat breast bones that prevent them from flying Ratites are generally large birds, and the ostrich is the largest living bird in the world
  • Exotic and Laboratory Animals - MSD Veterinary Manual
    Twelve species of birds are grouped as ratites, not including the order Tinamiformes These species include the ostrich, emu, rhea, cassowary, and kiwi The ostrich, emu, and rhea are the ratite species primarily raised in production facilities, whereas all ratite species may be found in zoo collections
  • Ratite - an overview | ScienceDirect Topics
    Ratite is not a strict taxonomic term; it is used to refer to flightless birds that do not have a keel but have, rather, a flat “raft-like” breast 2,19 In general, ratites are classified in one order, Struthioniformes, with four suborders with distinct geographic distributions: (1) Struthiones are endemic to the African continent (apart from in





中文字典-英文字典  2005-2009