class Animal
    attr_accessor :name
    attr_writer :color
    attr_reader :legs, :arms

    def self.all_species
        ['cat', 'cow', 'dog', 'duck', 'horse', 'pig']
    end

    def self.create_with_attributes (noise, color)
        animal = Animal.new(noise) # or use animal = self.new(noise)
        animal.color = color
        return animal
    end

    def initialize(noise, legs=4, arms=0)
        @noise = noise
        @legs = legs
        @arms = arms
        puts "A new animal has been instantiated."
    end
    def noise=(noise)
        @noise = noise
    end

    def noise
        @noise
    end

    def color
        "The color is #{@color}"
    end

end

puts Animal.all_species.inspect

animal1 = Animal.new("mooo", 5, 0)
animal1.name = "Steve"
puts animal1.name
animal1.color = "Black"
puts animal1.color
puts animal1.noise

puts ''

animal2 = Animal.create_with_attributes("Quack!", "white")
puts animal2.noise
puts animal2.color