A trace fossil formed by an animal during feeding, migration, or in the creation of a resting place. Burrows are formed in soft sediments and may occur on the surface or be the result of subsurface activities.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。