Light conditions and the evolution of the visual system in birds

Materials contain R codes with analyses (*.R), phylogenetic trees (*.tre) and dataset (SupplementaryDataset1.xlsx). Dataset contains variables expressing visual system architecture and exposure to environmental light across birds:

-eye axial length

-cornreal diameter

-optic tectum volume

-visual wulst volume

-nocturnal habits

-prefered habitat

These variables were extracted from literature and open sources for 760 avian species.

本数据集配套材料包含用于分析的R代码文件（*.R）、系统发育树文件（*.tre）以及数据集文件（SupplementaryDataset1.xlsx）。该数据集收录了760种鸟类的视觉系统结构特征与环境光照暴露相关变量，具体如下：
- 眼轴长度
- 角膜直径
- 视顶盖体积
- 视觉隆突（visual wulst）体积
- 夜行习性
- 偏好生境
所有变量均从公开文献与开源资源中提取获得。