2) pocket gopher. The Columbia Encyclopedia, Sixth Edition. 2001
...pocket gopher, see gopher....

3) Internet, the. The Columbia Encyclopedia, Sixth Edition. 2001
...The most popular features of the Internet include electronic mail (e-mail), discussion groups (called newsgroups or bulletin boards, where users can post messages...

4) ground squirrel. The Columbia Encyclopedia, Sixth Edition. 2001
...North America the name refers to members of the genus Citellus and sometimes to the closely related genera Tamias (chipmunk), Cynomys (prairie dog), and Marmota (marmot...

5) tortoise. The Columbia Encyclopedia, Sixth Edition. 2001
...Tortoises inhabit warm regions of all continents except Australia. They have club-shaped feet with reduced toes adapted for walking on land, and nearly all have high-domed...

6) rodent. The Columbia Encyclopedia, Sixth Edition. 2001
...The Rodentia is by far the largest mammalian order; nearly half of all mammal species are rodents. They are worldwide in distribution and are found in almost every...

7) mining. The Columbia Encyclopedia, Sixth Edition. 2001
...These resources include ores, which contain commercially valuable amounts of metals, such as iron and aluminum; precious stones, such as diamonds; building stones,...