Can't see custom entity

I have a custom chicken:

Code:java

import net.minecraft.server.v1_6_R3.EntityChicken;
import net.minecraft.server.v1_6_R3.EntityHuman;
import net.minecraft.server.v1_6_R3.PathfinderGoalNearestAttackableTarget;
import net.minecraft.server.v1_6_R3.PathfinderGoalSelector;
import net.minecraft.server.v1_6_R3.World;
 
public class derpychicken extends EntityChicken
{
 
    public derpychicken(World world)
    {
        super(world);
        this.targetSelector.a(2, new PathfinderGoalNearestAttackableTarget(this, EntityHuman.class, 0, true));
    }
 
 
}
 

I can kill it, and it drops items, but I can't see it.
Here's the code I use to spawn it:

Code:java

        CraftWorld c = (CraftWorld)l.getWorld();
        derpychicken fo = new derpychicken(c.getHandle());
        c.getHandle().addEntity(fo, SpawnReason.NATURAL);
fo.setLocation(x,y,z);