javascript: Functional inheritance

//Function inheritance
function Animal(name) {
    this.name = name

    this.say = function() {
        console.log(`I am ${this.name}`)
    }
}

function Rabbit(name) {
    Animal.call(this, name)

    this.skip = function() {
        console.log(this.name + ': I skip')
    }
}

let r1 = new Rabbit('r1')

r1.say()
r1.skip()