| Bedding is necessary for worms to burrow, bury food scraps, and also for moisture retention. |
| During winter months and aestivation periods, mussels will burrow into the substrate until only the apertures are protruding. |
| Roots burrow under my feet and leaves whisper to each other from opposite sides of the valley. |
| They were also kept in warrens, enclosed areas of land in which they could feed and burrow, and from whence they were conveniently caught. |
| Wiggling through fractured ice and snow crystals, they burrow as deep as three to six feet beneath the surface of the ice. |
| They burrow under the bark feeding on woody capillary tissue that the tree uses to transport nutrients. |
