One genetic study has traced its origins to the Late Cretaceous or Early Paleogene period.

一项基因研究表明，其起源可追溯到晚白垩世或早时期。

To be precise, we will be going back 66 million years ago to an event known as The Cretaceous–Paleogene extinction event, which is also known as the Cretaceous–Tertiary or K–T extinction.

准确， 们将回到 6600 万年前的白垩-灭绝事件，也称为白垩-第三或 K-T 灭绝事件。

Thanks to their mobility and adaptability, avian dinosaurs  survived into the Paleogene Period and filled vacant niches in tropical ecosystems around the  Equator.

由于其机动性和适应性，鸟类恐龙存活到了， 并填补了赤道周围热生态系统的空缺。

At the end of the Cretaceous Period, a fatal blow struck the ammonites and most of the nautiloids: the Cretaceous-Paleogene extinction event -- the same event that killed the non-avian dinosaurs.

在白垩末期，一次致命的打击降临到了菊石和大多数鹦鹉螺类身上：白垩-灭绝事件——同样也是导致非鸟类恐龙灭绝的事件。

This was the very beginning of the Paleogene Period, and the world was … kind of empty.

这是的 开端，世界… … 有点空虚。

According to  our fossil record, the earliest known primates emerged in primitive rainforests during the  Paleogene Period.

根据们的化石记录，已知最早的灵长类动物出现在的原始雨林中。

The K-Pg Extinction marks the boundary between the Cretaceous Period and the Paleogene Period, the first of the Cenozoic Era.

K-Pg 灭绝事件标志着白垩和（新生代的第一个）的分界。

Some parts  of the world were already scorching during the Late Cretaceous Period, the last great age of the  dinosaurs, but temperatures climbed even higher following a global catastrophe known as the  Cretaceous-Paleogene or K-Pg Extinction Event.

在白垩晚期，即恐龙的最后一个伟大时代， 世界上的一些区已经变得炎热，但在一场被称为白垩-或 K-Pg 灭绝事件的全球灾难之后， 气温甚至攀升得更高。

When this giant object slammed into Earth, it triggered one of the  most devastating events in our planet's history, known as the Cretaceous-Paleogene or K-Pg  Extinction.

当这个巨大的物体撞击球时，它引发了们星球历史上最具破坏性的事件之一，被称为白垩-或 K-Pg 灭绝。

The relatives of modern-day dogs, cats, and bears,   known as Carnivorans, emerged during the Paleogene Period, about 60 million years ago.

现代狗、猫和熊的亲被称为食肉动物，出现于，大约 6000 万年前。

66 Million Years Ago in the Paleogene the continents look roughly the same as today and mammals take over.

6600万年前在，各大洲的轮廓大致与今天相似，哺乳动物开始主宰球。

In some books, too, you will find the tertiary and quaternary taken out and replaced by periods of different lengths, called the Paleogene and Neogene.

在一些书中, 你会发现第三和第四被取出, 取而代之的是不同长度的时期, 称为和新。

The first mammals actually  emerged millions of years earlier, but during the Paleogene, they grew and diversified  like never before.

第一批哺乳动物实际上早在数百万年前就出现了，但在， 它们的生长和多样化程度前所未有。

Paleogene, the two periods whose boundary is marked by this event.

的德语缩写之后，这两个时期的边界 以该事件为标志。