Money in the animal kingdom Animals living in packs must have ways to decide how to distribute their goods among the pack members.  Just like prices can appear in an exchange economy, prices could appear in pack economy.  Though money can serve many different functions, are there examples of money-like objects (abstract symbols of value?) in the animal kingdom?
The only use of money (other than by humans— who, it should be noted, lived for most of human history without it) in the animal kingdom that I'm aware of has been when researchers have taught other primates (Capuchin monkeys) how to use it. While the introduction of currency was apparently successful (there was Capuchin prostitution), the research did not go so far as to show that equilibrium prices would arise endogenously through exchange.