Color AVP Committed by evolution to live together, animal partnerships are widespread in the natural world. Some of these relationships between species are ancient and intimate. All reflect a balance of benefit and exploitation. A goby acts as look-out for a shrimp, which is almost blind. Ferocious Australian ants milk a certain caterpillar, and like good farmers, return it to shelter at night.
Some microscopic parasites perform beneficial cleaning services for their hosts.
Other animal partners simply live and let live.