Their unwillingness to end the chase can sometimes land them in quite a bit of trouble — there are known cases of Jack Russell Terriers staying in underground burrows for days on end in pursuit of their prey. (happyjackrussell.com)
They have a series of underground burrows along miles of well - known territory. (second-opinion-doc.com)
The animals» underground burrows protect them from temperature swings and serve the same purpose as clothing and shelter in human communities. (sciencemag.org)