Edgar the Chicken

Edgar III is the name Ryan gave to his Emergency Chicken that

he keeps trapped in his house behind four glass blocks. Edgar III was trapped in the house after Let's Play Minecraft Episode 53, when Ryan lost Shopping List due to his inability to find an egg to make a cake.

Service
Edgar III is under a constant danger of being killed that Edgar the Cow is not. He at first had a sign next to him that read "In case of cake BREAK GLASS." It was soon replaced with the far more sinister "In case of emergency, break glass.  KILL CHICKEN." Which was broken by Michael to put in the "Free Edgar 2013" sign, but Ryan quickly repaired it. Edgar III is also constantly supplying eggs that Ryan can pick up through the glass.

Dark Achievement City
In Dark Achievement City, Edgar III is simply an egg inside a picture frame on Ryan's wall, though it is still trapped behind the four glass blocks. Also the sign next to Edgar III reads something slightly different than its overworld coutnerpart, reading "In Case of Emergency, Break Egg"