My Seramas are around a pound. Some are smaller. They are actually classified by sizes (A,B&C) with the A being the smallest and C the largest and least desirable. I have no idea how they would do with other bantams as I have always kept mine in separate pens. You can keep 4 comfortably in a 3ft x 4ft pen. Many people keep them inside their homes as pets. If you have an incubator I would happily send you 6 or so eggs free if you would be willing to pay shipping. I always like to see others get started with these beautiful little birds.