恐龍卡第 1684 張，共 2 027 張

Sirindhorna

名字的意思： “named after Princess Maha Chakri Sirindhorn of Thailand”1

吃：植物有喙的草食恐龍白堊紀早期

Sirindhorna was a plant-eating dinosaur that lived in what is now Thailand about 120 million years ago. It had a beak and lots of teeth for chewing tough plants. It is one of the best skulls ever found from a dinosaur like this in Southeast Asia.1 2

生存年代

121 到 113 百萬年前5

白堊紀早期

化石發現地

Ban Saphan Hin, Nakhon Ratchasima Province, northeastern Thailand5 1

長度

6 m (20 ft)3

體重

1 公噸 (2,200 lb)3

高度

2 m (6.6 ft)3

最高速度

時速約 33 公里（21 英里）

跑步, 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 50 隻狗一樣重

跟 6 隻狗從鼻子接到尾巴一樣長跟 33 根香蕉頭尾相接一樣長跟 200 顆西瓜一樣重跟 53 個幼兒園小朋友一樣重跟 31 個小學生一樣重跟 2 隻北極熊一樣重能在 11 秒內跑完 100 公尺（最快的人類要 9.6 秒）

Sirindhorna 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)

Sirindhorna 時速約 33 公里 (21 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

Sirindhorna is known from a nearly complete skull and lower jaws, which is very rare for dinosaurs from Southeast Asia.2

It had a long ridge on top of its skull called a sagittal crest, which helped anchor strong jaw muscles.2

Its teeth had a main ridge and a secondary ridge, which helped grind plant material.2

The fossils were found by farmers digging a reservoir, and then scientists studied the site.1

Sirindhorna lived in a semi-arid environment with meandering rivers, about 120 million years ago.2

It is one of the most primitive members of the group Hadrosauroidea, which includes the duck-billed dinosaurs.2

Sirindhorna 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Sirindhorna 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。

你們都在問

關於 Sirindhorna 最常被問的問題

?What did Sirindhorna eat?

It was a plant-eater. Its teeth had a main ridge and a secondary ridge to help grind tough plants.1 4

?How big was Sirindhorna?

Scientists don't know its exact size yet, because only skull and jaw bones have been found. It was a medium-sized ornithopod dinosaur.1 4

?Where was Sirindhorna found?

It was found in northeastern Thailand, at a site called Ban Saphan Hin in Nakhon Ratchasima Province. Farmers digging a reservoir discovered the fossils.1 4

?Is Sirindhorna a dinosaur?

Yes, it is a dinosaur. It is a plant-eating ornithopod dinosaur from the group Hadrosauroidea, which includes duck-billed dinosaurs.1 5

給恐龍專家

學名: Sirindhorna
命名者: Shibata et al. 20155
類群: 有喙的草食恐龍
科 / 演化支: Hadrosauroidea5
分類: Ornithischia > Ornithopoda > Iguanodontia5
岩石的年代: 121 到 113 百萬年 (Aptian)5
岩層: Khok Kruat5
國家: 泰國5
化石紀錄: The Paleobiology Database 收錄 1 筆5
發現: Sirindhorna was named in 2015 by a team of Japanese, Thai, and Chinese scientists. The fossils were found at Ban Saphan Hin in Thailand, and the name honors Princess Maha Chakri Sirindhorn.1 2
仍有爭議: Scientists are not sure about the exact age of the rocks where Sirindhorna was found, but they think it lived during the Aptian stage, about 120 million years ago.1 2