// Like trait in Rust
aspect Bird {
  void fly(int km);
  void layAnEgg();
}

struct Turkey {
  Colour colour = BLACK;
  Genre genre;
  weight float;
  long distance = 0;
  long eggs = 0;
}

def Bird: Turkey {
  void fly(int km) {
    distance += km;
  }
  
  void layAnEgg() {
    eggs += 1;
  }
}