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

其，位人员假设生代哺乳动物体型较小与其夜间活动直接相关。

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，人员观察了当今 2400 多种哺乳动物，并创建了算法来从夜间活动到昼夜活动遗传转变。

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.

在 2014 年篇论文， 当人员回顾更远化石记录时，他们发现在最早哺乳动物出现之前， 脊椎动物就已经进化出夜行性，属于个被称为合弓类谱系。