If you've read your Scrum literature you'll definitely heard of pigs and chickens. Ade Miller however has identified a few behaviors that you might see in your team that are bad or really bad. And just for the fun of it he came up with a number of animals to represent the different behaviors. The "new" animals in the Scrum farm are:

• Cows - contribute to the team but are hard to rely on since they have their own agenda.
• Seagulls - act like part of the team but they never contribute, just get in the way.
• Foxes - steal resources, including pigs.
• Rubber ducks - feel out of place and don't want to be part of the whole Scrum thingy.