恐龍卡第 0081 張，共 2 027 張

Alvarezsaurus

名字的意思： “Don Gregorio Alvarez's lizard”1

吃：昆蟲奇特的羽毛恐龍白堊紀晚期

Alvarezsaurus was a tiny, fast-running dinosaur that lived in Argentina about 86 to 83 million years ago. It had a long tail and probably used its sharp claws to dig for insects. Scientists think it was one of the earliest members of a weird group of dinosaurs with strong, short arms.1 3

生存年代

86 到 84 百萬年前3

白堊紀晚期

化石發現地

Bajo de la Carpa Formation, Neuquén, Argentina3 1

長度

1 到 1.4 m (3.3 到 4.6 ft)1

體重

3 kg (7 lb)1

高度

0.58 m (1.9 ft)

估計值

最高速度

時速約 30 公里（19 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 25 根香蕉一樣重

跟 3 隻家貓從鼻子接到尾巴一樣長跟 8 根香蕉頭尾相接一樣長大約跟一隻家貓一樣重跟 25 根香蕉一樣重能在 12 秒內跑完 100 公尺（最快的人類要 9.6 秒）

Alvarezsaurus 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)

Alvarezsaurus 時速約 30 公里 (19 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

Alvarezsaurus was named after Don Gregorio Alvarez, an Argentine historian, not after a dinosaur scientist.1

Its third toe bone (metatarsal III) was the longest, and its fourth toe bone was unusually long too.1

Unlike many of its later relatives, Alvarezsaurus did not have its ankle bones (astragalus and calcaneum) fused together.1

The shoulder blade of Alvarezsaurus was curved and smaller than that of later alvarezsaurids like Mononykus.1

Its tail vertebrae had sharp undersides and triangular side projections, a feature shared with other alvarezsaurids.1

Alvarezsaurus is considered a basal (early) member of the alvarezsaurid family, which includes dinosaurs with strong, short arms and big claws.1

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

?How big was Alvarezsaurus?

Alvarezsaurus was small, about 1 to 1.4 metres (3.3 to 4.6 feet) long and weighed around 3 kilograms (6.6 pounds).1

?What did Alvarezsaurus eat?

It may have eaten insects. Its sharp claws and strong arms suggest it dug into termite or ant nests, though scientists are not completely sure.1 2

?Could Alvarezsaurus run fast?

Yes, its leg structure suggests it was a fast runner. It had long legs and a long tail for balance.1 2

?Did Alvarezsaurus have feathers?

No direct feather fossils are known for Alvarezsaurus, but a close relative, Shuvuuia, had downy, feather-like coverings, so it likely had feathers too.2

?When did Alvarezsaurus live?

It lived during the Late Cretaceous, about 86 to 83 million years ago, in what is now Argentina.1

?Was Alvarezsaurus a dinosaur?

Yes, Alvarezsaurus was a small theropod dinosaur, part of the alvarezsaurid family.1

給恐龍專家

學名: Alvarezsaurus
命名者: Bonaparte 19913
類群: 奇特的羽毛恐龍
科 / 演化支: Alvarezsauridae3
分類: Theropoda > Alvarezsauridae3
岩石的年代: 86 到 84 百萬年 (Santonian)3
岩層: Bajo de la Carpa3
國家: 阿根廷3
化石紀錄: The Paleobiology Database 收錄 1 筆3
發現: Alvarezsaurus was named by Argentine paleontologist José Bonaparte in 1991. The first fossils were found in the Bajo de la Carpa Formation in Argentina.1 3
仍有爭議: Scientists are not sure whether Alvarezsaurus was more closely related to birds or to other non‑bird dinosaurs. Some studies place it with early birds, but others keep it among the theropod dinosaurs.1