Let's get off the thunderbird train.

Name: Lesser Earth Dragon

Found in mountain environments

Draconic species (No, really)

Food: Small rodents

Life Span: 50 years

Live Birth

Young are brown in color, darken to black as adults

Other: Need a deep terrarium with room to dig. Can breathe out rocks and mud, but since adults don't get bigger than three feet long, it's usually not a problem, as long as they're trained to only do this in their enclosure.