Emu love to play chase, wither what they are chasing, wants to be chased or not. When they get excited they play chase..... many mornings I've awoke to a ruckus of quacking ducks, squawking chickens, beating wings and feathers flying as the emu jump for joy, roll and run.... often running over the occasional blindsided critter that happened to wander into their path.... I've had 2 chickens that ended up having an egg go shooting out of them like a cannon ball because an emu happened to run by and squeezed them by accident. Chickens were fine, although shaken up. Mine all roam a pasture, so normally critters can get out of the way. Once had a piece of plywood left on the ground, emus went running one direction, mini horse the other, both met on the plywood at the same time. Next thing I saw after the dust cleared was an Emu and a mini horse on their backs, legs in the air, looking around like - "What the heck happened'... LOL. Just keep an eye on them, they should be fine, but they can get to playing rough, and on occasion they can get a mean streak when excited. If they are in a smaller area, I would consider having a separate area for them, just to keep the chickens content, LOL