The study looked at different types of small mammals in Africa to see how their ability to move around affects the variety of species in their communities. They found that animals that can't travel far have more changes in the types of species they have, while those that can move easily have more similar species. Shrews, which can't travel far, have the most variety in their communities, while bats, which can fly long distances, have the least. This shows that how well animals can move around is a big factor in how diverse their communities are.