You probably do or don't know what they are...
Furries are people that believe that they have a spirit animal representing their personality.
Furries are expected to make their own character or fursona as it's referred to.
Me? My character's name is Sirius Starson. He's a Wolf!
Another thing about furries is that they can make a fursuit which represents their character...only thing about that is that they cost...A LOT
One of my students is a Furry, she makes and sells beautiful fursuits. From what I know its a large community and there are conventions right?
Yep there are almost a million people in the fandom! And yes there are HUGE conventions like Anthrocon (US)