Comparative analyses of egg colouration and experimental data suggest that variation in egg colours between species is shaped by thermoregulatory needs.

中文翻译：

---

较深的鸡蛋会感到热量。

鸡蛋着色和实验数据的比较分析表明，不同物种之间鸡蛋颜色的变化受温度调节需求的影响。