avoidMeta.js

class Animal { } 

class Rabbit extends Animal {
  move() {
    console.log("I'm running");
  }  
}

class Seagull extends Animal {
  move() {
    console.log("I'm flying");
  }  
}

let bunny = new Rabbit();
let livingstone = new Seagull();

bunny.move();
livingstone.move();