The story of the chicken and the pig is often used in scrum to illustrate the difference in commitment between different people on a project. 
Pigs are those who are responsible for delivering quality in time and within the budget. Account managers, product owners, project managers and developers/designers can be considered pigs. They have to deliver what they committed to! Their bacon is on the line.
Internal or external stakeholders can be qualified as chickens. Examples are the C-suite, managers, directors,… Some of them believe they have the right to interfere at any moment, although they tend to vanish when it starts to heat up. They just throw eggs.
As a project or account manager, always be aware of who the chickens are and who the pigs are. If you feel that the integrity of your team is being violated by a chicken, react as a pig.
Communicate clearly that you are owning the project together with your team. You’ll take the chicken’s opinion into account, but as it is your team’s responsibility to deliver, you will make the final call.
Read more on the chicken and the pig on implementingscrum.com
