恐龍卡第 0750 張，共 2 027 張

Gracilornis

名字的意思： “slender bird”1

吃：肉早期鳥類白堊紀早期

Gracilornis was a tiny, early bird that lived in China during the Age of Dinosaurs. It had a very slender skeleton and could fly, but it was not a dinosaur itself. It belonged to a group of ancient birds called enantiornithines.1 2

生存年代

121 到 113 百萬年前4

白堊紀早期

化石發現地

Liaoning Province, China1

長度

0.1 到 0.3 m (0.3 到 1 ft)2

最高速度

時速約 27 公里（17 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？

跟 9 塊積木排成一排一樣長能在 14 秒內飛越一整座足球場

Gracilornis 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)

Gracilornis 時速約 27 公里 (17 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

Gracilornis had a very small sternum, or breastbone, compared to its body length. The sternum was only about 11% of the trunk length.3

This bird lived around 110 million years ago, during the Early Cretaceous period.1

The name Gracilornis comes from Latin and Greek words meaning 'slender bird', because its skeleton was very thin and light.1

Gracilornis is known from a nearly complete skull and skeleton, which helps scientists understand what it looked like.1

It belonged to a group called Enantiornithes, which were the most common birds during the Cretaceous period.1

Gracilornis 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Gracilornis 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: Gracilornis
命名者: Li and Hou 20114
類群: 早期鳥類
科 / 演化支: Cathayornithidae4
分類: Theropoda > Avialae4
岩石的年代: 121 到 113 百萬年 (Aptian)4
岩層: Jiufotang4
國家: 中國4
化石紀錄: The Paleobiology Database 收錄 1 筆4
發現: Gracilornis was named by Li Li and Hou Shilin in 2011. They found the fossil in the Jiufotang Formation in Chaoyang, Liaoning, China.1
仍有爭議: Scientists are not sure exactly how Gracilornis flew, because its small sternum might mean it had weak flight muscles.3