drawing.draw is not a function

hla I am learning javascript and in this occasion I run into a problem that maybe is something very basic but as I am just learning to program I do not give with the error. In code that I will leave below an error occurs when I try to access the draw property, when I was researching the objects in javascript recommended that instead of our constructor create a function grow for each of the instances as in the following code

    function Animal (edad) {
  this.edad = edad;
  this.crecer = function () {
    this.edad = this.edad + 1;
    return this.edad;
  }
}

so if we create an array with 1000 instances of Animal 1000 different (and independent) functions will be created, something that in terms of efficiency is tremendously undesirable.

therefore I recommended writing in the following way

    function Animal (edad) {
  this.edad = edad;
}

Animal.prototype.crecer = function () {
  this.edad = this.edad + 1;
  return this.edad;
};

Now in my code (I will discuss below) I store each object in an array and when trying to interact with each one and using the draw method, I get the following error drawing.draw is not a function

I do not know if I'm failing if someone has the answer, they explain to me

my code

    let x, y, newX, newY, oldy, oldx;
let circlecontainer= [];


for(let i = 0; i < 30; i++){

    let red = Math.random() * 250;
    let green = Math.random() * 250;
    let blue = Math.random() * 250;
    x = Math.random() * innerWidth;
    y = Math.random() * innerHeight;
    var circle = new Circle (x,y,red,green,blue);
    circlecontainer.push(circle);

}

for (let i = 0; i < circlecontainer.length; i++) {

    let dibujo =circlecontainer[i].draw();

}

function Circle (x,y,red,green,blue){

    this.x = x;
    this.y = y;
    this.red = red;
    this.green = green;
    this.blue = blue;

}




Circle.prototype.draw = function(){

    c.beginPath()
    c.arc(this.x, this.y, 10, 0, Math.PI * 2, false);
    c.fillStyle = 'rgba(${this.red},${this.green},${this.blue}, 0.7)';
    c.fill();
};