Underneath the bed is the perfect home. Since they are social animals, dust bunnies also like under beds because there is plenty of room to reproduce. This makes feeding them very easy, because everyone has dust and lint lying around. Anyone who doesn't should not be allowed to exist. When dust bunnies get older, however, they must be watched closely, as they tend to develop a taste for larger things such as clothing that is on the floor.
Socks are a special favorite.
The first stage is as a fetus. This looks like just a single particle of dust, but is really a growing, developing creature. Most fetuses do not survive, largely because of such things as human mothers who believe in cleaning. If a dust bunny survives the first stage, it becomes a toddler. This stage can be recognized as when the bunny really begins to take shape.