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HTML

              
                <div class="wrapper">
  
    <!-- remove display: none from marker class to see these -->
    <div class="marker red"></div>
    <div class="marker blue"></div>
    <div class="marker yellow"></div>
    <div class="marker pink"></div>
    <div class="marker green"></div>
    <div class="marker purple"></div>
  
    <div class="duck down">
      <div class="neck-base">
        <div class="neck">
          <div class="head"></div>
        </div>
      </div>
      <div class="tail"></div>
      <div class="body"></div>
      <div class="legs">
        <div class="leg"></div>
        <div class="leg"></div>
      </div>
    </div>

  </div>

  <button class="create-duckling"></button>
  
  <div class="indicator"></div>
  <div class="sign">
    by masahito / <a href="http://www.ma5a.com/" >ma5a.com</a>
  </div>
              
            
!

CSS

              
                * {
  box-sizing: border-box;
} 

body {
  padding: 0;
  margin: 0;
  font-family: sans-serif;
  background-color: rgb(23, 184, 139);
}

p, h1, h2, h3, h4 {
  display: inline-block;
  margin-block-start: 0em;
  margin-block-end: 0em;
  margin-inline-start: 0px;
  margin-inline-end: 0px;
  padding-inline-start: 0px;
}

.wrapper {
  position: fixed;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

.duck *,
.duckling * {  
  background-size: calc(var(--w) * var(--m)) calc(var(--h) * var(--m)) !important; 
  background-repeat: no-repeat !important;
  image-rendering: pixelated;
}

.duck,
.duckling {
  position: absolute;
  transition: 1s;
  --w: 20;
  --h: 14; 
  --m: 2px;
  --neck-w: 16;
  width: calc(var(--w) * var(--m));
  height: calc(var(--h) * var(--m));
  --color: #fff;
  --dark-yellow: #fcc85b;
}

.body {
  position: absolute;
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAOCAYAAAAvxDzwAAAAAXNSR0IArs4c6QAAAFRJREFUOE9jZMAC/v///x+bOLoYIyMjI4YYsgCxBuEzGG4DuYbBDIe5FmwgpYYhG0p9A6nlOrgrR6CBgz+WYbFDaeSgJGxKDUXO0xiZm5QwxVY4AADV9Tf/s/CuJAAAAABJRU5ErkJggg==);
  width: calc(var(--w) * var(--m));
  height: calc(var(--h) * var(--m));
}

.tail {
  position: absolute;
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAYAAAAHCAYAAAArkDztAAAAAXNSR0IArs4c6QAAAC1JREFUGFdjZICC/////wcxGRkZGcE0iIAJwhSBJHFLoKuG68IpgdcOZEmYvQA6WRwAeFIlLwAAAABJRU5ErkJggg==);
  --w: 6;
  --h: 7;
  --x: calc(7 * var(--m));
  --y: calc(-2 * var(--m));
  width: calc(var(--w) * var(--m));
  height: calc(var(--h) * var(--m));
  transform: translate(var(--x), var(--y));
  transition: 1s;
  z-index: -10;
}

.up .tail {
  --y: calc(-2 * var(--m));
}

.right .tail {
  --x: calc(-2 * var(--m));
}

.down .tail {
  --y: calc(-4 * var(--m));
}

.left .tail {
  --x: calc(15 * var(--m));
}


.neck {
  position: absolute;
  background-color: --var(--color);
  width: calc(var(--neck-w) * 1px);
  height: calc(8 * var(--m));
  transition: 0.8s;
  bottom: 0;
}

.neck-base {
  position: absolute;
  width: calc(8 * var(--m));
  height: calc(8 * var(--m));
  --x: calc(6 * var(--m));
  --y: calc(2 * var(--m));
  transform: translate(var(--x), var(--y));
  transition: 0.3s;
  z-index: 2;
}

.up .neck-base{
  --y: calc(2 * var(--m));
}

.right .neck-base{
  --x: calc(10 * var(--m));
}

.down .neck-base{
  --y: calc(3 * var(--m));
}

.left .neck-base{
  --x: calc(2 * var(--m));
}


.head {
  position: absolute;
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAQCAYAAAAWGF8bAAAAAXNSR0IArs4c6QAAAF9JREFUOE/t1EsKACAIBUDf/Q9tRBhmf7FdLQPHUgsUvBDs0RRkZl4lAzCM7TZ3kE1i4Qa8xQTXaAW9mEU/6J9Kacy7GuazeTs9HBu57C26HGxdwR18/PT8bSmR4b9NAm06MBHW1BzVAAAAAElFTkSuQmCC);
  --w: 20;
  --h: 16; 
  width: calc(var(--w) * var(--m));
  height: calc(var(--h) * var(--m));
  margin-top: calc(var(--h) * -2px + 4px);
  margin-left: calc(((var(--w) * 2) - var(--neck-w)) * -0.5px);
}


.down.left .head,
.down.right .head {
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAQCAYAAAAWGF8bAAAAAXNSR0IArs4c6QAAAIRJREFUOE9jZKAyYKSyeQw4Dfz///9/fJYxMjJi1YshSMggdEvQDUYxkFTDYIYjGwo3kFzD0A0dYgZmmUowTDv9Amfk4pOHhSOKl6luICWJHMOFf05EYU3IzOZLCdqDkWxwGQYzCZ+hGAmbkGG4DMWb9QgZymKxjOhCBK4Ql6GkGAbyDQD+hEQRv/jlIAAAAABJRU5ErkJggg==);
}

.up.left .head,
.up.right .head {
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAQCAYAAAAWGF8bAAAAAXNSR0IArs4c6QAAAIFJREFUOE9jZICCPyei/sPYyDSLxTJGbOK4xMCKcRkG00SKoYzYDGM2X0rQUYyMjFhdjuFCYgxDtg3dYLgtIJeSahjMYGRD4Qb+//8fa6QQ9DtUAczQUQOJDTFMdbQPQ5Cd5MY01mQD8wSphuJM2OihQshgvFmP/KjAEjnUNAxkFgC13zgRXycP6gAAAABJRU5ErkJggg==);
}

.down .head {
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAQCAYAAAAWGF8bAAAAAXNSR0IArs4c6QAAAJZJREFUOE9jZKAyYKSyeQw4Dfz///9/fJYxMjJi1YshSMggdEvQDUYxkFTDYIYjGwo3kFzD0A0dogZmmUowTDv9Am+KQlcDC0esXqa6geQkdgwXggxBj+m/J6Oxms1svhRFHGuygamAGYrLMJg6mKF4EzZM8Z8TUXizHUwdi8UyjJyGMy8TMhSbYSCL8JY2uAzFZRjIQAA6bUoRLru2rQAAAABJRU5ErkJggg==);
}

.up .head {
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAQCAYAAAAWGF8bAAAAAXNSR0IArs4c6QAAAIFJREFUOE/t01EOgCAIBmBZ3anOUuers9SdajgfcGr8NNl6yzfH/BBBCsa6joW18DjvhI7BAMIEQqgKJmyYNuvy4T7XoKEPkJnVMmGJRJVRbXoxSUIFmkEv1qI/aE6KGZTGfPeGKb230+rYSD29aIklA/7lN7iF8jz626CfhDf0Joo7dzsRfj//OAAAAABJRU5ErkJggg==);
}

.left .head,
.right .head {
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAQCAYAAAAWGF8bAAAAAXNSR0IArs4c6QAAAIBJREFUOE9jZKAyYKSyeQw4Dfz///9/fJYxMjJi1YshSMggdEvQDUYxkFTDYIYjGwo3kFzD0A0dOAOzTCUYpp1+gTOeYN4m2oUkG/jnRBTWZMJsvpSopIriQlyGwUwixlC4gYQMI8ZQjGRDyFB8LsSZsEkNQ6KzHlExgEcR1UsbAK27NhEDLz+RAAAAAElFTkSuQmCC);
}

.right .head {
  transform: scale(-1, 1);
}

.legs {
  position: absolute;
  display: flex;
  justify-content: space-between;
  width: calc(12 * var(--m));
  height: calc(7 * var(--m));
  left: calc(4 * var(--m));
  bottom: calc(-4 * var(--m));
  transition: 1s;
  z-index: -1;
  --angle: 180deg;
}

.leg {
  position: relative;
  background-color: var(--dark-yellow);
  width: var(--m);
  height: calc(7 * var(--m));
}

.leg:after {
  position: absolute;
  background-color: var(--dark-yellow);
  content: '';
  width: 4px;
  height: 7px;
  left: -1px;
  bottom: 0px;
  transform-origin: bottom center;
  transform: rotate(var(--angle));
}

.up .legs {
  --angle: 0deg;
}

.up.right .legs {
  --angle: 45deg;
}

.right .legs {
  --angle: 90deg;
}

.down.right .legs {
  --angle: 135deg;
}

.down .legs {
  --angle: 180deg;
}

.down.left .legs {
  --angle: 225deg;
}

.left .legs {
  --angle: 270deg;
}

.up.left .legs {
  --angle: 315deg;
}

.waddle .leg {
  animation: waddle 0.3s infinite;
}

.leg:nth-child(1) {
  --one: calc(7 * var(--m));
  --two: calc(4 * var(--m));
}

.leg:nth-child(2) {
  --one: calc(4 * var(--m));
  --two: calc(7 * var(--m));
}

@keyframes waddle {
  0%, 100% {
    height: var(--one);
  }
  50% {
    height: var(--two);
  }
}

.left .legs,
.right .legs {
  width: calc(10 * var(--m));
  left: calc(5 * var(--m));
}

.duckling-target {
  position: absolute;
  /* background-color: #fff945; */
  width: 12px;
  height: 12px;
  transition: 1.8s;
  border-radius: 50%;
}

/* duckling */

.duckling {
  position: absolute;
  /* left: 200px; */
  --neck-w: 8;
  --m: 1px;
  --color: #fff04d;
  transition: 0.5s;
}

.duckling .head {
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAQCAYAAAAWGF8bAAAAAXNSR0IArs4c6QAAAGFJREFUOE9jZKAyYKSyeQw4Dfz/wfc/PssYBTZj1YshSMggdEvQDUYxkFTDYIYjGwo3kFzD0A0dNZD8VAmLGNqFIcht5MY01mQD8yyphuJN2MghSMhgorMe+dEC0Un10gYAfowwEW4KJvUAAAAASUVORK5CYII=);
  margin-left: calc((var(--w) - var(--neck-w)) * -0.5px);
  margin-top: calc(var(--h) * -1px + 2px);
}

.duckling.down.left .head,
.duckling.down.right .head {
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAQCAYAAAAWGF8bAAAAAXNSR0IArs4c6QAAAIVJREFUOE9jZKAyYKSyeQw4Dfz/wfc/PssYBTZj1YshSMggdEvQDUYxkFTDYIYjGwo3kFzD0A2lrYFZLqfAFk7bY4Y1PvDJw7yN4sLBbyAliRzDy39ORGFNyMwanwnag5FscBkGMwmfoRgJm5BhuAzFm/UIGcpisYzoQgSuEJehpBgG8g0Az0pNESONMLcAAAAASUVORK5CYII=);
}

.duckling.up.left .head,
.duckling.up.right .head {
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAQCAYAAAAWGF8bAAAAAXNSR0IArs4c6QAAAIFJREFUOE9jZICCPyei/sPYyDSLxTJGbOK4xMCKcRkG00SKoYzYDGPW+EzQUYwCm7G6HMOFxBiGbBu6wXBbQC4l1TCYwciGwg38/8EXa6QQ9DtUAczQUQOJDTFMdbQPQ5Cd5MY01mQD8wSphuJM2OihQshgvFmP/KjAEjnUNAxkFgDi4TsRTK7K8AAAAABJRU5ErkJggg==);
}

.duckling.down .head {
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAQCAYAAAAWGF8bAAAAAXNSR0IArs4c6QAAAJdJREFUOE9jZKAyYKSyeQw4Dfz/wfc/PssYBTZj1YshSMggdEvQDUYxkFTDYIYjGwo3kFzD0A2lj4FZLqfAFk/bY4Y1XrDJw7yN1YWD30ByEjuGl0GGoMf03xu8WM1m1viMIo412cBUwAzFZRhMHcxQvAkbpvjPiSi82Q6mjsViGUZOw5mXCRmKzTCQRXhLG1yG4jIMZCAAfBdQEXRmcAUAAAAASUVORK5CYII=);
}

.duckling.up .head {
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAQCAYAAAAWGF8bAAAAAXNSR0IArs4c6QAAAIRJREFUOE9jZMAD/pyI+o9NmsViGSMubTglcBkGMwiXoVgNBBnGrPEZn+MZ/t7gZcBmKIaB/z/4YvUmTi8KbEYxA4VDqmEwSxiRDIUbSK5h6IaOGog3peCVhEUM7cIQZD25MY012cD8Q6qhyIaBzMCZlwkZjG4QPD2SHw3YdeJ0IbkWAQBsyTsRjEgDjwAAAABJRU5ErkJggg==);
}

.duckling.left .head,
.duckling.right .head {
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAQCAYAAAAWGF8bAAAAAXNSR0IArs4c6QAAAH9JREFUOE9jZKAyYKSyeQw4Dfz/wfc/PssYBTZj1YshSMggdEvQDUYxkFTDYIYjGwo3kFzD0A0l2sAsl1NgvdP2mGENWpgrh5CBf05EYU0mzBqfiUqqKF7GZRjMJGIMhRtIyDBiDMVINoQMxedCnAmb1DAkOusRFQN4FFG9tAEAKQA+EfjQv5MAAAAASUVORK5CYII=);
}

.duckling .body {
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAOCAYAAAAvxDzwAAAAAXNSR0IArs4c6QAAAFRJREFUOE9jZMAC/n/w/Y9NHF2MUWAzI4YYsgCxBuEzGG4DuYbBDIe5FmwgpYYhG0p9A6nlOrgrR6CBgz+WYbFDaeSgJGxKDUXO0xiZm5QwxVY4AADr4DT71oa+KgAAAABJRU5ErkJggg==);
}

.duckling .tail {
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAYAAAAHCAYAAAArkDztAAAAAXNSR0IArs4c6QAAAC1JREFUGFdjZICC/x98/4OYjAKbGcE0iIAJwhSBJHFLoKuG68IpgdcOZEmYqwCKgxp+Dp/FvAAAAABJRU5ErkJggg==);
}

.duckling.waddle .leg {
  animation: waddle 0.2s infinite;
}

.duckling .leg:after {
  height: 3px;
  width: 2px;
  left: 0;
  bottom: 0px;
}

.duckling.hit .waddle {
  animation: waddle 0.1s infinite;
}

button.create-duckling {
  position: fixed;
  bottom: 45px;
  right: 30px;
  --size: 60px;
  background-image: url(data:image/png;base64,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);
  width: var(--size);
  height: var(--size);
  border-width: 0;
  background-color: rgb(2, 117, 115);
  background-size: var(--size) !important; 
  background-repeat: no-repeat !important;
  border-radius: 50%;
  image-rendering: pixelated;
  cursor: pointer;
  z-index: 100;
}

button.create-duckling:hover {
  border: 2px solid white;
  width: calc(var(--size) + 2px);
  height: calc(var(--size) + 2px);
}


/* other */

.sign {
  position: absolute;
  color: #fff945;
  bottom: 10px;
  right: 10px;
  font-size: 10px;
}

a {
  color: #fff945;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.indicator {
  position: fixed;
  top: 10px;
  left: 10px;
  color: #fff945;
  display: none; /* uncomment this bit to see development info */
}

.indicator {
  position: fixed;
  top: 10px;
  right: 10px;
}

.marker {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-top: -5px;
  margin-left: -5px;
  transition: 0.1s;
  z-index: 100;
  display: none; /* uncomment this bit to see marker */
}

.red { 
  background-color: rgb(223, 74, 41); 
}
.blue { 
  background-color: rgb(140, 238, 250); 
}
.yellow {
  background-color: yellow; 
}
.pink {
  background-color: hotpink; 
}
.green { 
  background-color: rgb(88, 236, 127); 
}
.purple {
  background-color: purple; 
}

              
            
!

JS

              
                 const wrapper = document.querySelector('.wrapper')
  const marker = document.querySelectorAll('.marker')
  const indicator = document.querySelector('.indicator')
  const createDucklingBtn = document.querySelector('.create-duckling')

  const data = {
    interval: null,
    target: { x: 0, y: 0 },
    newTarget: { x: 0, y: 0 },
    cursor: { x: 0, y: 0 },
    duck: {
      x: 0,
      y: 0,
      angle: 0,
      direction: '',
      offset: { x: 20, y: 14 },
      el: document.querySelector('.duck'),
      direction: 'down',
    },
    ducklingTargets: [],
    ducklings: []
  }

  const directionConversions = {
    360: 'up', 45: 'up right', 90: 'right', 135: 'down right', 180: 'down', 225: 'down left', 270: 'left', 315: 'up left',
  }

  const px = num => `${num}px`
  const radToDeg = rad => Math.round(rad * (180 / Math.PI))
  const degToRad = deg => deg / (180 / Math.PI)
  const nearestN = (x, n) => x === 0 ? 0 : (x - 1) + Math.abs(((x - 1) % n) - n)
  const randomN = max => Math.ceil(Math.random() * max)
  const overlap = (a, b, buffer) =>{
    const bufferToApply = buffer || 20
    return Math.abs(a - b) < bufferToApply
  }

  const positionMarker = (i, pos) => {
    marker[i].style.left = px(pos.x)
    marker[i].style.top = px(pos.y)
  }

  const offsetPosition = data => {
    return {
      x: data.x + data.offset.x,
      y: data.y + data.offset.y,
    }
  }

  const checkCollision = ({ a, b, buffer }) =>{
    return overlap(a.x, b.x, buffer) && overlap(a.y, b.y, buffer)
  }

  const setStyles = ({ el, x, y }) => {
    el.style.transform = `translate(${x ? px(x) : 0}, ${y ? px(y) : 0})`
    el.style.zIndex = y
  }

  const updateData = (data, newData) => {
    Object.keys(newData).forEach(key => {
      data[key] = newData[key]
    })
  }

  const moveDucklingTargets = ({ x, y }) => {
    data.ducklingTargets.forEach((duckling, i) => {
      clearTimeout(duckling.timer)
      duckling.timer = setTimeout(() => {
        moveDuck(duckling, getOffsetPos({
          x, y,
          angle: data.duck.angle + 180,
          distance: 60 + (80 * i)
        }))
      }, 150 + randomN(40))
    })
  }

  const moveDuck = (duck, { x, y }) => {
    updateData(duck, { x, y })
    setStyles(duck)
  }

  const moveMotherDuck = ({ x, y }) => {
    moveDuck(data.duck, { x, y })
    moveDucklingTargets({ x, y })
  }

  const elAngle = (el, pos) => {
    const { x, y } = pos
    const angle = radToDeg(Math.atan2(el.y - y, el.x - x)) - 90
    const adjustedAngle = angle < 0 ? angle + 360 : angle
    return nearestN(adjustedAngle, 1)
  }

  const rotateCoord = ({ deg, x, y, offset }) => {
    const rad = degToRad(deg)
    const nX = x - offset.x
    const nY = y - offset.y
    const nSin = Math.sin(rad)
    const nCos = Math.cos(rad)
    return {
      x: Math.round((nCos * nX - nSin * nY) + offset.x),
      y: Math.round((nSin * nX + nCos * nY) + offset.y)
    }
  }

  const distanceBetween = (a, b) => Math.round(Math.sqrt(Math.pow((a.x - b.x), 2) + Math.pow((a.y - b.y), 2)))

  const getOffsetPos = ({ x, y, distance, angle }) => {
    return {
      x: x + (distance * Math.cos(degToRad(angle - 90))),
      y: y + (distance * Math.sin(degToRad(angle - 90)))
    }
  }

  const getNewPosBasedOnTarget = ({ start, target, distance: d, fullDistance }) => {
    const { x: aX, y: aY } = start
    const { x: bX, y: bY } = target

    const remainingD = fullDistance - d
    return {
      x: Math.round(((remainingD * aX) + (d * bX)) / fullDistance),
      y: Math.round(((remainingD * aY) + (d * bY)) / fullDistance)
    }
  }

  const getDirection = ({ pos, facing, target }) => {
    const dx2 = facing.x - pos.x
    const dy1 = pos.y - target.y
    const dx1 = target.x - pos.x
    const dy2 = pos.y - facing.y

    return dx2 * dy1 > dx1 * dy2 ? 'anti-clockwise' : 'clockwise'
  }

  const updateCursorPos = e => {
    data.cursor.x = e.pageX
    data.cursor.y = e.pageY

    positionMarker(0, data.cursor)
  }

  const returnAngleDiff = ({ angleA, angleB }) => {
    const diff1 = Math.abs(angleA - angleB)
    const diff2 = 360 - diff1

    return diff1 > diff2 ? diff2 : diff1
  }

  const getDirectionClass = angle => {
    return directionConversions[nearestN(angle, 45)]
  }

  const setNewTargetAndDirection = fullDistance => {
    const distanceToMove = fullDistance > 80 ? 80 : fullDistance
    data.newTarget = getNewPosBasedOnTarget({
      distance: distanceToMove,
      fullDistance,
      start: offsetPosition(data.duck),
      target: data.cursor
    })
    data.duck.direction = getDirection({
      pos: offsetPosition(data.duck),
      facing: data.target,
      target: data.newTarget
    })

    positionMarker(3, offsetPosition(data.duck))
    positionMarker(2, data.target)
    positionMarker(1, data.newTarget)
  }

  const turnMotherDuckAndUpdateDirection = ({ diff, limit }) => {
    const angle = elAngle(offsetPosition(data.duck), rotateCoord({
      deg: {
        'clockwise': diff > limit ? limit : diff,
        'anti-clockwise': diff > limit ? -limit : -diff
      }[data.duck.direction],
      x: data.target.x,
      y: data.target.y,
      offset: offsetPosition(data.duck),
    }))

    // determine how much the duck waddles
    moveMotherDuck(getOffsetPos({
      x: data.duck.x,
      y: data.duck.y,
      distance: 50,
      angle
    }), data.duck)
    data.target = getOffsetPos({
      x: data.duck.x,
      y: data.duck.y,
      distance: 100,
      angle
    })
    
    // check how much the duck turned and round to nearest 45 degrees
    const newAngle = elAngle(offsetPosition(data.duck), data.target)
    updateData(data.duck, { angle: newAngle, direction: getDirectionClass(newAngle) })
    data.duck.el.className = `duck waddle ${data.duck.direction}`
    indicator.innerHTML = `duck waddle ${data.duck.direction}`
  }
  
  moveMotherDuckTowardsTarget = () => {
    const angle = elAngle(offsetPosition(data.duck), data.newTarget)
    const direction = getDirectionClass(angle)
    data.duck.el.className = `duck waddle ${direction}`
    indicator.innerHTML = `duck waddle ${direction}`

    moveMotherDuck(data.newTarget, data.duck)
    positionMarker(4, data.duck)

    data.target = getOffsetPos({
      x: data.duck.x,
      y: data.duck.y,
      distance: 50,
      angle
    })
    updateData(data.duck, { angle, direction })
    positionMarker(5, data.target)
  }

  const triggerDuckMovement = () => {
    data.interval = setInterval(() => {
      const fullDistance = distanceBetween(offsetPosition(data.duck), data.cursor)

      if (!fullDistance || fullDistance < 80) {
        // stop waddling when close to target
        data.duck.el.classList.remove('waddle')
        return
      }
      setNewTargetAndDirection(fullDistance)

      const howMuchMotherDuckNeedsToTurn = returnAngleDiff({
        angleA: elAngle(offsetPosition(data.duck), data.target),
        angleB: elAngle(offsetPosition(data.duck), data.newTarget)
      })
      const maxAngleMotherDuckCanTurn = 60

      howMuchMotherDuckNeedsToTurn > maxAngleMotherDuckCanTurn
        ? turnMotherDuckAndUpdateDirection({ 
            diff: howMuchMotherDuckNeedsToTurn, 
            limit: maxAngleMotherDuckCanTurn 
          })
        : moveMotherDuckTowardsTarget()

    }, 500)
  }

  const moveDucklings = () => {
    data.ducklings.forEach((duckling, i) => {
      if (duckling.hit) return
      const fullDistance = distanceBetween(duckling, data.ducklingTargets[i])
  
      if (!fullDistance || fullDistance < 40) {
        duckling.el.classList.remove('waddle')
        return
      }
      moveDuck(duckling, getNewPosBasedOnTarget({
        distance: 30,
        fullDistance,
        start: duckling,
        target: data.ducklingTargets[i]
      }))
      const angle = elAngle(offsetPosition(duckling), data.ducklingTargets[i])
      updateData(duckling, { direction: getDirectionClass(angle) })
      duckling.el.className = `duckling waddle ${duckling.direction}`
    })
  }

  const collisionCheckDucklings = () => {
    data.ducklings.forEach(duckling => {
      const { x, y } = duckling.el.getBoundingClientRect()
      if (checkCollision({ 
        a: data.duck, 
        b: { x, y },
        buffer: 40  
      })) {
        duckling.el.classList.add('hit')
        duckling.hit = true
  
        const { direction } = duckling
        const x = direction.includes('right') 
          ? -20 
          : direction.includes('left') 
          ? 20
          : 0
  
        const y = direction.includes('up') 
          ? 20 
          : direction.includes('down')
          ? -20
          : 0 
  
        moveDuck(duckling, {
          x: duckling.x + x, 
          y: duckling.y + y, 
        })
        setTimeout(()=> {
          duckling.el.classList.remove('hit')
          duckling.hit = false
        }, 900)
      }
    })
  }

  const createDuckling = () =>{
    const newDucklingTarget = document.createElement('div')
    newDucklingTarget.classList.add('duckling-target')
    const newDuckling = document.createElement('div')
    newDuckling.classList.add('duckling')
    newDuckling.innerHTML = `
      <div class="neck-base">
        <div class="neck">
          <div class="head"></div>
        </div>
      </div>
      <div class="tail"></div>
      <div class="body"></div>
      <div class="legs">
        <div class="leg"></div>
        <div class="leg"></div>
      </div>`
    ;[newDucklingTarget, newDuckling].forEach(ele => wrapper.appendChild(ele))

    data.ducklings.push({ el: newDuckling, x: 0, y: 0, direction: 'down', offset: { x: 10, y: 7 }, hit: false })
    data.ducklingTargets.push({ el: newDucklingTarget, x: 0, y: 0, timer: null, offset: 6 })

    moveDuck(data.ducklings[data.ducklings.length - 1], { x: -50, y: -50, })
  }


  // set up
  ;['click', 'mousemove'].forEach(action => window.addEventListener(action, updateCursorPos))

  createDucklingBtn.addEventListener('click', ()=> {
    createDuckling()

    clearInterval(data.interval)
    triggerDuckMovement()
  })

  const { width, height } = wrapper.getBoundingClientRect()
  updateData(data.cursor, { x: width / 2, y: height / 2 })
  triggerDuckMovement()
  for (let n = 0; n < 3; n++) {
    createDuckling()
  }
  setInterval(moveDucklings, 300)
  setInterval(collisionCheckDucklings, 100)
              
            
!
999px

Console