| fossilshk | 2019-1-16 09:35 PM |
|
雞的祖先是霸王龍? 鳥類的起源
[img]http://www.fossilshk.com/forum_image/f3461.jpg[/img]
你會把霸王龍跟雞搞混嗎？怎麼可能！我們都知道霸王龍是聰明的捕食者，恐龍中最可怕的一種；而雞就是無害的小動物而已，甚至還有點笨！不過呢，經過很多年的研究，無限多次的辯論，古生物學家終於發現，當今世上和兇猛的霸王龍親緣關係最近的動物是雞。證據是什麼？目前看來是在霸王龍骨骼化石裡發現的一種蛋白質，如今只存在於鳥類身上，而不是爬蟲類。也就是說，鳥的祖先要往獸腳亞目中去找。獸腳亞目是一群肉食性恐龍，身上長滿羽毛，而且會下蛋，牠們的後代子孫都是這樣。
2億年前
有一小群已經長出羽毛的獸腳亞目恐龍開始一步步縮小體積。牠們具備滑翔的能力。
1億年前
原本比較屬於爬蟲類特質的牙齒消失，此後開始發展出不同形狀與大小的鳥喙。
5500萬年前
鳥類發展出拍擊翅膀飛行的能力；而同一時間，昆蟲的體型開始變小，成了牠們的主要獵物。
《國家地理》雜誌中文版
[url]https://www.natgeomedia.com/reading/book-news/87354?fbclid=IwAR2aDqzTN5EFsL2wldbRRCP7k9vAzZxlZQNvyNPZSC-AxsZj-8-6ie18ZcI[/url] |
| dragonfly | 2019-1-20 09:28 AM |
|
| 雞的祖先不是馳龍科帶羽毛的恐龍嗎 |
| fossilshk | 2019-2-5 10:36 PM |
|
[quote]原帖由 [i]dragonfly[/i] 於 2019-1-20 05:28 PM 發表
雞的祖先不是馳龍科帶羽毛的恐龍嗎 [/quote]
雞的祖先可能跟霸王龍是近親,所以有一些地方相似而已 |
| Dinosaurprince | 2019-2-6 08:27 AM |
|
| I actually compared T-rex collagen protein w/ chicken's several years ago in the lab out of boredom. they have like 80%+ similarity if i didnt remember wrong |
|
[quote]原帖由 [i]Dinosaurprince[/i] 於 2019-2-6 04:27 PM 發表
I actually compared T-rex collagen protein w/ chicken's several years ago in the lab out of boredom. they have like 80%+ similarity if i didnt remember wrong [/quote]
看不明,太專業了
:L |
| fossilshk | 2019-2-28 08:33 PM |
|
[quote]原帖由 [i]Dinosaurprince[/i] 於 2019-2-6 04:27 PM 發表
I actually compared T-rex collagen protein w/ chicken's several years ago in the lab out of boredom. they have like 80%+ similarity if i didnt remember wrong [/quote]
Dinosaurprince有空跟大家解釋一下雞與恐龍的關係, 相信很多人都想知道雞的祖先是由那一種恐龍而來:) |
|
[quote]原帖由 [i]fossilshk[/i] 於 2019-3-1 04:33 AM 發表
Dinosaurprince有空跟大家解釋一下雞與恐龍的關係, 相信很多人都想知道雞的祖先是由那一種恐龍而來:) [/quote]
很想知道! |
| Dinosaurprince | 2019-3-13 09:01 PM |
|
回復 #6 fossilshk 的帖子
chicken evolved from a group of dinosaur called "birds" :)
It is a scientific consensus that birds are dinosaurs and should be grouped as a clade within theropod dinosaur. In fact, evolutionary speaking, the relationship between a Tyrannosaurus rex and sparrow is closer to the relationship between Triceratops and Tyrannosaurus rex in phylogenies.
For the graph there, I will explain it further next week after I settle down and secure my research position at Oxford. |
|
| 不太可能是從霸王龍進化而來吧，霸王龍體型那麼大，它們已經是白垩纪最後一批恐龍，之後並沒有一種過度生物體型和特徵跟霸王龍相若 |
Powered by Discuz! Archiver 4.1.0
© 2001-2006 Comsenz Inc.
Processed in 0.005317 second(s), 2 queries |