恐龍卡第 0900 張，共 2 027 張

Janavis

名字的意思： “Janus bird, after the Roman god of beginnings and endings”1

吃：肉早期鳥類白堊紀晚期

Janavis was a toothed bird that lived right at the end of the Age of Dinosaurs. It was one of the last birds with teeth, and its skull could move like a modern bird's skull.1

生存年代

72 到 66 百萬年前3

白堊紀晚期

化石發現地

Eben Emael, Belgium1

翼展

1.5 m (4.9 ft)1

體重

1.12 kg 到 1.604 kg (2 到 4 lb)1

最高速度

時速約 42 公里（26 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？

牠的翅膀有多寬？

牠有多重？

跟 13 根香蕉一樣重

跟 3 隻家貓從鼻子接到尾巴一樣長比一隻家貓還輕跟 13 根香蕉一樣重能在 9 秒內飛越一整座足球場

Janavis 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)

Janavis 時速約 42 公里 (26 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

Janavis lived about 66.8 million years ago, just 800,000 years before the asteroid that killed the dinosaurs.1

Its wing bones were hollow and filled with air, like modern birds, making it lighter for flying.1

The fossil was found in a Belgian quarry in 2000 by an amateur fossil hunter named Rudi Dortangs.1

Janavis had a skull that could move its upper jaw up and down, a feature of modern birds called neognathous palate.1

Scientists first thought a piece of its skull was a wing bone, until a CT scan in 2021 showed the truth.1

Janavis was bigger than its relative Ichthyornis, with a wingspan of about 1.5 metres (5 feet).1

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

?How big was Janavis?

Janavis was a relatively large bird, with an estimated wingspan of about 1.5 metres (5 feet) and a weight of around 1.5 kilograms (3.3 pounds).1 2

?Did Janavis have teeth?

Yes, Janavis had teeth. It was one of the last toothed birds to ever live.1 2

?When did Janavis live?

Janavis lived about 66.8 million years ago, right at the end of the Cretaceous period, just 800,000 years before the asteroid impact.1

?Could Janavis fly?

Yes, Janavis could fly. Its wing bones were hollow and filled with air, like modern birds, making it lighter for flying.1

迷思破解王

迷思： All ancient birds had rigid skulls like dinosaurs.

真相： Janavis had a flexible skull like modern chickens and ducks, showing that movable skulls evolved early.1

給恐龍專家

學名: Janavis
命名者: Benito et al. 20223
類群: 早期鳥類
科 / 演化支: Ichthyornithes3
分類: Theropoda > Avialae3
岩石的年代: 72 到 66 百萬年 (Maastrichtian)3
岩層: Maastricht3
國家: 比利時3
化石紀錄: The Paleobiology Database 收錄 1 筆3
發現: The fossil was collected in 2000 by amateur palaeontologist Rudi Dortangs in Belgium. It was first reported in 2002, and in 2022 scientists named it Janavis finalidens after CT scans revealed its true identity.1
仍有爭議: Scientists debate whether Janavis could fly as well as modern birds, because its wing bones were very air-filled but its shoulder blade lacked a normal hook.1