1.   Then they burrow deep into the still soft sand and excavate a small chamber.

2.   They hibernate during the dry season by burrowing deep into the damp sand.

3.   After venturing among Hindu gods and archaic space wars, he would go burrowing deep into the human head.

4.   It was one of those moments that burrows deep into the memory but readily scurries to the surface whenever we hear the name.

5.   Living in colonies, they burrowed deep in gold-bearing soil beneath the sand, then regurgitated their burrowings in mounds.

6.   Nevertheless, through eight decades he has burrowed deep into the American psyche.

7.   The fires have burrowed deep into vast peat bogs and seams of coal, where experts say they may continue to smolder for years.

8.   The same was once said of a second baseman named Steve Sax, whose problem seemed to burrow deep into his head before long.