2 sentences

1. 人类原本就不是夜行性动物。

   rén​lèi yuán​běn jiù bù​shì yè​xíng​xìng dòng​wù.

   Humans are not naturally nocturnal animals.

   Source: CCMatrix

2. 它们是夜行性动物，具有很强的社会性。

   tā​men shì yè​xíng​xìng dòng​wù, jù​yǒu hěn qiáng de shè​huì​xìng.

   They are nocturnal, highly social animals.

   Source: CCMatrix