恐龍卡第 1653 張，共 2 027 張

Siats

名字的意思： “Named after Siats, a man-eating monster from Ute Native American legends.”1 2

吃：肉肉食恐龍白堊紀晚期

Siats was a giant meat-eating dinosaur that lived in North America about 98 million years ago. It was one of the biggest predators of its time, and it may have hunted plant-eating dinosaurs like Eolambia.1 2

生存年代

100 到 94 百萬年前5

白堊紀晚期

化石發現地

Fossils were found in the Cedar Mountain Formation in Utah, USA.1 5

長度

10 m (33 ft)3

體重

3.9 公噸 (8,600 lb)1

高度

3 m (9.8 ft)

估計值

最高速度

時速約 25 公里（16 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？

估計值

牠有多重？

跟 2.5 台汽車一樣重

跟 2 台汽車排成一排一樣長跟 56 根香蕉頭尾相接一樣長跟 200 隻狗一樣重跟 780 顆西瓜一樣重跟 5 整班小學生一樣重跟 9 隻北極熊一樣重能在 14 秒內跑完 100 公尺（最快的人類要 9.6 秒）

Siats 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)

Siats 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

Siats was one of the largest predators in North America during the early Late Cretaceous, weighing about 3.9 metric tons (4.3 short tons).1

The only known Siats skeleton is from a young animal, not a fully grown adult, so it might have been even bigger.1 2

Siats lived at the same time and place as small tyrannosauroids, and scientists think it may have kept them from growing huge.2

The name Siats comes from a man-eating monster in Ute tribal legends from Utah.1 2

Siats is the first megaraptoran dinosaur ever found in North America.2

The fossil bones were found sticking out of a hillside during a 2008 expedition.1

Siats 的 AI 繪圖 — 這是電腦根據科學家目前的知識，用 AI 畫出 Siats 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 Siats 最常被問的問題

?How big was Siats?

Siats was about 10 metres (33 feet) long and weighed around 3.9 metric tons (4.3 short tons). That is as heavy as two large cars.1 4

?What did Siats eat?

Siats was a meat-eater that probably hunted plant-eating dinosaurs like Eolambia. It was the top predator of its time.2 4

?Was Siats bigger than T. rex?

No, Siats was smaller than T. rex. T. rex could be over 12 metres (40 feet) long and weigh more than 8 metric tons, while Siats was about 10 metres (33 feet) long and weighed about 4 metric tons.1 4

?When did Siats live?

Siats lived about 98 million years ago, during the early Late Cretaceous period. That is about 30 million years before T. rex appeared.1 2

?Where was Siats found?

Siats was found in Utah, USA, in the Cedar Mountain Formation. Its bones were first seen sticking out of a hillside in 2008.1 4

?Is Siats a dinosaur?

Yes, Siats is a dinosaur. It is a large meat-eating theropod dinosaur, not a pterosaur or marine reptile.1 5

迷思破解王

迷思： Some people think Siats was a tyrannosaur, like T. rex.

真相： Scientists think Siats was an allosauroid, a different group of meat-eaters, not a tyrannosaur.1 2

給恐龍專家

學名: Siats
命名者: Zanno and Makovicky 20135
類群: 肉食恐龍
科 / 演化支: Megaraptora5
分類: Theropoda > Megaraptora5
岩石的年代: 100 到 94 百萬年 (Cenomanian)5
岩層: Cedar Mountain5
國家: 美國5
化石紀錄: The Paleobiology Database 收錄 1 筆5
發現: Siats was discovered by Lindsay Zanno during a 2008 Field Museum expedition with Peter Makovicky. The bones were collected from 2008 to 2010 in Utah, and the dinosaur was named in 2013.1
仍有爭議: Scientists are not sure exactly where Siats belongs in the dinosaur family tree. Some think it was a megaraptoran, while others suggest it was closer to tyrannosaurs.1