static void Main()
{
Animal[] animals =
{
new Dog(4, "Ginka", Gender.Female),
new Dog(5, "Rex", Gender.Male),
new Dog(9, "Pedro", Gender.Male),
new Dog(2, "Oskar", Gender.Male),
new Cat(5, "Tochka", Gender.Female),
new TomCat(2, "Tiger", Gender.Male),
new Kitten(1, "Puma", Gender.Female),
new Frog(1, "Ivo", Gender.Male)
};
var dogs = animals.Where(d => d is Dog);
var cats = animals.Where(c => c is Cat);
var frogs = animals.Where(f => f is Frog);
Console.WriteLine("Dogs' avarige age is: {0}", Dog.CalculateAvrgAge(dogs));
Console.WriteLine("Cats' avarige age is: {0}", Cat.CalculateAvrgAge(cats));
Console.WriteLine("Frogs' avarige age is: {0}", Frog.CalculateAvrgAge(frogs));
}
