static void Main()
        {
            // Uncomment if you want to use the ISound method

            //var dog = new Dog("Pesho", 5, Gender.Something, "Street Finest");
            //Console.WriteLine(dog.ToString());
            //dog.MakeSound();

            //var kitty = new Kitten("Oi kotio", 1, "Sivo");
            //Console.WriteLine(kitty.ToString());
            //kitty.MakeSound();

            //var frog = new Frog("Lupi", 2, Gender.Something, "Philautus chotta");
            //frog.MakeSound();

            var catList = new List <Cat>
            {
                new Cat("Kotaran", 3, Gender.Male, "Siamese"),
                new Tomcat("Tom the cat", 4, "Persian"),
                new Kitten("Oi kotio", 1, "Shorthair"),
                new Cat("Maca", 13, Gender.Something, "Street Finest"),
                new Tomcat("Dinko", 3, "Siberian"),
                new Cat("Lucifer", 13, Gender.Something, "Scotish fold")
            };

            Console.WriteLine("Cats average age: {0:F2}", Animal.AnimalAverageAge(catList)); // Using Animal class static method

            var dogList = new List <Dog>
            {
                new Dog("Pesho", 15, Gender.Something, "Street Finest"),
                new Dog("Balkanka", 5, Gender.Female, "Siberian Husky"),
                new Dog("Petrohan", 7, Gender.Male, "Retriever"),
                new Dog("Sheitana", 2, Gender.Female, "German Shepherd"),
                new Dog("Dobrinka", 17, Gender.Female, "Poodle")
            };

            Console.WriteLine("Dogs average age: {0:F2}", Animal.AnimalAverageAge(dogList)); // Using Animal class static method

            var frogList = new List <Frog>
            {
                new Frog("Veneta Raikova", 70, Gender.Female, "Philautus chotta"),
                new Frog("Nikoleta Lozanova", 100, Gender.Something, "Philautus amboli"),
                new Frog("Drisko", 10, Gender.Male, "Philautus marki"),
                new Frog("Sashka Vaseva", 17, Gender.Female, "Philautus sushili")
            };

            Console.WriteLine("Frogs average age: {0:F2}", Animal.AnimalAverageAge(frogList)); // Using Animal class static method
        }