The shape of the (sub)vertical, unbranched burrow you would like to determine can be described as... Please, click on the appropriate statement to bring you one step further!

Shape
The overall appearance of the burrow can be described as:

• Cylindrical
• Conical or club-shaped
• Plug-shaped
• U- and bow-shaped
• J- or fan-shaped
• Helicoidal
• Spherical or hemispherical
• Ovoid or fusiform
• Y-shaped