#include <iostream>
#include <vector>

class Animal
{
 public:
  virtual void eat()
  {
    std::cout << "Tier isst" << std::endl;
  }
};

class Cat : public Animal
{
 public:
  void eat() override
  {
    std::cout << "Katze isst eine Maus" << std::endl;
  }
};

class Mouse : public Animal
{
 public:
  void eat() override
  {
    std::cout << "Maus isst K\204se" << std::endl;
  }
};

class Worm : public Animal
{
};

int main()
{
  std::vector<Animal> zoo = { Animal(), Cat(), Mouse() };
  for (Animal& animal : zoo)
  {
    animal.eat();
  }
  return 0;
}