animal.rb

class Animal
  attr_reader :name

  def initialize(name)
    @name = name
  end
  def self.phyla
    ["phyla1", "phyla2", "phyla3", "phyla4"]
  end
  def eat(food)
    "#{name} eats a #{food}."
  end
end

interface.rb

require_relative "lion"
require_relative "meerkat"
require_relative "warthog"

animals = [
  Lion.new("Simba"),
  Meerkat.new("Timon"),
  Warthog.new("Pumba"),
  Lion.new("Nala")
]

animals.each do |animal|
  puts animal.talk
end

animals.each do |animal|
  puts animal.eat("meat")
end

lion.rb

require_relative "animal"

class Lion < Animal
  def talk
    "#{name} roars"
  end
  def eat(food)
    "#{super(food)} Law of the Jungle!"
  end
end

meerkat.rb

require_relative "animal"

class Meerkat < Animal
  def talk
    "#{name} barks"
  end

end

warthog.rb

require_relative "animal"

class Warthog < Animal
  def talk
    "#{name} grunts"
  end

end