Ground Sloth

Named after the extinct, ground-dwelling relative of modern-day sloths, the Ground Sloth is a person who walks very slowly in front of you, especially while you're in a hurry. Whether out of malice or apathy, Ground Sloths tend to inhabit very narrow spaces, such as sidewalks or corridors, making bypassing them a difficult, dangerous or physically impossible task. To add insult to injury, Ground Sloths often travel in groups, known as herds.

I was heading down to the train station when I got stuck behind the slowest herd of ground sloths that ever roamed the earth. Missed my train because of them.