恐龍卡第 1975 張，共 2 027 張

Yixianornis

名字的意思： “Yixian Formation bird”1

吃：肉早期鳥類白堊紀早期

Yixianornis was a bird that lived 120 million years ago in what is now China. It was about the size of a chicken and had broad, rounded wings that helped it fly through dense forests. Its tail feathers could fan out like a modern bird's tail.1

生存年代

121 到 113 百萬年前2

白堊紀早期

化石發現地

Qianyang, Yixian County, Liaoning Province, China1 2

長度

0.19 到 0.2 m (0.6 到 0.7 ft)1

翼展

0.4 m (1.3 ft)1

體重

0.2 kg 到 0.35 kg (0 到 1 lb)1

高度

0.115 m (0.4 ft)1

最高速度

時速約 25 公里（16 英里）

飛行, 估計值

牠生活在什麼時候？

三疊紀

侏羅紀

白堊紀

2 億 5200 萬年前20114566，小行星撞地球

牠有多大？

牠有多長？

牠有多高？

牠有多重？

跟 3 根香蕉一樣重

比一隻家貓還輕跟 6 塊積木排成一排一樣長小到能從椅子底下走過去能在 15 秒內飛越一整座足球場

Yixianornis 跟「你」比起來有多大？

只是在你的瀏覽器裡算算數學。什麼都不會被儲存或傳送出去。

牠有多快？

走路的人 時速約 5 公里 (3 mph)

騎腳踏車的小朋友 時速約 12 公里 (7 mph)

Yixianornis 時速約 25 公里 (16 mph)

一匹飛奔的馬 時速約 65 公里 (40 mph)

一隻獵豹 時速約 100 公里 (62 mph)

酷東西

趣味知識

Yixianornis is one of the best-preserved bird fossils from the Jehol group, with bones that are mostly uncrushed and clear impressions of wing and tail feathers.1

Its tail feathers were arranged in a graduated series, with the outer feathers anchored closer to the base of the tail, giving it a rounded silhouette.1

Yixianornis had a rectrical bulb, a muscle that allows tail feathers to be fanned out during flight and retracted when at rest, just like in modern birds.1

The tips of its jaws were toothless and had small pits and grooves, possibly indicating the presence of a beak.1

Its flight feathers were very broad and rounded, not narrow and pointed like in many other early birds.1

Scientists think Yixianornis was diurnal, meaning it was active during the day, similar to most modern birds.1

Yixianornis is the most primitive bird known to have an essentially modern pygostyle and fan of tail feathers.1

Yixianornis 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Yixianornis 可能的樣子。這只是猜測：真正的動物可能長得不一樣，也沒有人知道牠真正的顏色。

給恐龍專家

學名: Yixianornis
命名者: Zhou and Zhang 20012
類群: 早期鳥類
科 / 演化支: Hongshanornithidae2
分類: Theropoda > Avialae2
岩石的年代: 121 到 113 百萬年 (Aptian)2
岩層: Jiufotang2
國家: 中國2
化石紀錄: The Paleobiology Database 收錄 1 筆2
發現: Yixianornis was named by Zhou Zhonghe and Zhang Fucheng in 2001 based on a nearly complete fossil with feather impressions found in the Jiufotang Formation of Liaoning, China.1 2
仍有爭議: Scientists are still debating whether Yixianornis had a beak at the tips of its jaws, because the pits and grooves could also be from other features.1