compile error problems

Hello!

I get the following compile error below in the complete program below.
Any suggestion

Error 1 Using the generic type 'System.Collections.Generic.IEnumerator<T>'
requires '1' type arguments
C:\tony\ConsoleApplication15\ConsoleApplication15\Program.cs 80 9
ConsoleApplication15

namespace ConsoleApplication15
{
class Program
{
static void Main(string[] args)
{

}
}

public abstract class Animal
{
string name;
public Animal(string name)
{
this.name = name;
}

public string Name
{
get { return name; }
}

public abstract void MakeANoise();
}

public class Chicken : Animal
{
public Chicken(string name) : base(name)
{}

public override void MakeANoise()
{
Console.WriteLine("{0} says 'cluck!'", Name);
}
}

public class Cow : Animal
{
public Cow(string name) : base(name)
{ }

public override void MakeANoise()
{
Console.WriteLine("{0} says 'moo!'", Name);
}
}

public class SuperCow : Cow
{
public SuperCow(string name) : base(name)
{ }

public void Fly()
{
Console.WriteLine("{0} is flying!", Name);
}

public override void MakeANoise()
{
Console.WriteLine("{0} says 'here I come to save the day!'",
Name);
}
}


public class Farm<T> : IEnumerable<T>
where T : Animal
{
private List<T> animals = new List<T>();

public List<T> Animal
{
get { return animals; }
}

IEnumerator IEnumerable.GetEnumerator()
{
return animals.GetEnumerator();
}

public IEnumerator<T> GetEnumerator()
{
return animals.GetEnumerator();
}


public void MakeNoises()
{
foreach (T animal in animals)
{
animal.MakeANoise();
}
}

public void FeedTheAnimals()
{
foreach (T animal in animals)
{
animal.Feed();
}
}

public Farm<Cow> GetCows()
{
Farm<Cow> cowFarm = new Farm<Cow>();
foreach (T animal in animals)
{
if (animal is Cow)
cowFarm.animals.Add(animal as Cow);
}

return cowFarm;
}
}
}

//Tony


.

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