Any gif experts in the guild?

I was just talking to someone about gifs and I wondered if they can be made in Gimp. I googled it and found some tuts. But I have a question:

Can you place small gifs into a larger gif?

eg. create a matchstick man riding a bike as a small gif, and another matchstick man walking a dog, and then place these together into a large gif of a scrolling background so it looks like both characters are moving in the same scene.

I know you could make one gif of all three elements, but if they are separate I could pick n mix the smaller elements with different backgrounds without having to redraw everything.

As you can see, I know nothing about this stuff - yet.

What's possible?