New...residents? employees? pets?

Last night, I scurried up to Madison for a class at Olbrich Botanical Garden about Vermicomposting. It was an interesting class. She demonstrated setting up a worm bin using a small storage container and talked about caring for and maintaining the worms and bin, as well as finding supplies around town. With her description, it would have been quite straightforward to get the parts together and set up a worm bin, but she had sample bins for sale for $10 at the class. I figured that the convenience of not having to run errands up in Madison to collect parts and to find the time to put the pieces together made the price seem like a pretty good deal, so I came home with a worm bin complete with worms and a first bit of food for them to eat.
The bin:

and one of the residents:

We added some coffee grounds and scraps from prepping tomatoes for canning tomato today. We will still be feeding our compost bin in the yard, but picking out the choice bits to feed the worms. Especially this time of year when there is a whole lotta canning going on, we generate a ton of compost! All three kids are pretty excited about it, but my bug boy Beeb is especially taken by them. Before bed last night, he came up to me and said, "Thank you for getting us worms, Mommy."
So are they merely new residents in our household? Employees who are producing some fantastic soil amendments in exchange for room and board? Or pets that we have to check on and talk to regularly throughout the day?