Pablo did his own rat habitat (Pablorat.gif). One side of the habitat is screens with ventilator fans blowing through them. The other side has carbon to absorb wastes and odors. Water is in bottles with nipples. As the rat drinks a spring makes the bottle smaller so that the water is always under pressure. The water is found in the outer ring. There is another passageway with food adhered to the surface. There is another passageway where the rats are to go to the bathroom. The entrances to each passage way are rubber through which the rats must squeeze. When they leave the waste passageway there is a brush which will clean them off. The central area is a place to sleep.