adj. Living on or in the ground: terricolous worms.
[From Latin terricola, earth-dweller : terra, earth; see ters- in Indo-European roots + -cola, -colous.]
"Terricolous." The American Heritage(r) Dictionary of the English Language, Fourth Edition. Houghton Mifflin Company, 2004. 25 Jan. 2008. Dictionary.com
Today's example will be in the form of a limerick, which I just wrote.
Sorry to all limerick purists, but it is clean.
There once was an alien on earth
Who remarked with undisguised mirth
It is ridiculous
This species terricolous
Grounded by gravity from birth