Interliving is a basic organizing pattern of life. Most interliving benefits both partners, a win-win relationship. This is called symbiosis. Some interliving benefits only one partner, but does not hurt the other. Many more interliving arrangements exist than are shown here.
Every large organism is a home to a host of tiny organisms.
Horses and cows could not digest their food without the interliving bacteria inside their stomachs. We humans cannot digest our food without our specialized bacteria either. No animal can. Every tree gives a home to thousands of interliving insects and other small lives. Each picture below shows an interliving relationship.