In a 2017 study, researchers looked at more than 2400 species of mammals today and created algorithms to study the genetic transitions from nocturnality to diurnality.

在2017年的一项研，研人员分析了超过2400种现存哺乳动物，并创建算法来研行性到昼行性的遗传转变。

What this means is that that nocturnality is because they are trying to avoid the human predator, right?

这意味着它们的行性是因为图避开人类这个捕食者，对吗？

And in a 2014 paper, when the researchers looked even farther back in the fossil record, they found that nocturnality evolved in vertebrates before the earliest mammals appeared, within a lineage known as synapsids.

而在2014年的一篇， 研人员进一步追溯化石记录时发现，行性在最早的哺乳动物出现之前就已经在脊椎动物演化出来，这个演化分支被称为兽孔目。

And so it's possible that the nocturnality of wolves, instead of having anything to do with fear of humans, has to do with tracking their prey.

因此，狼的行性可能与对人类的恐惧无关，而是与追踪猎物有关。

In it, one researcher hypothesized that the small body size of mammals in the Mesozoic was directly related to their nocturnality.

在这项研，一位研人员假设生代哺乳动物的小体型与其行性直接相关。

And so, you know, the nocturnality that we see of large carnivores, including our wolves, right?

因此，你知道，我们看到的包括狼在内的大型食肉动物的行性行为，对吧？