CodePen Embed - CSS Rooster Animation

<body>
    <div class="rooster">
      <div class="rooster__eyes">
        <div class="rooster__eye rooster__eye--1">
          <div class="rooster__eye-ans"></div>
          <div class="rooster__eye-ans--d"></div>
        </div>
        <div class="rooster__eye rooster__eye--2">
          <div class="rooster__eye-ans"></div>
          <div class="rooster__eye-ans--d"></div>
        </div>
      </div>

      <div class="rooster__mouth"></div>
      <div class="rooster__mouth-d rooster__mouth-d--shadow"></div>
      <div class="rooster__mouth-d"></div>
      <div class="rooster__head">
        <div class="rooster__head--wing"></div>
        <div class="rooster__head--wing--2"></div>
        <div class="rooster__head--wing--3"></div>
        <div class="rooster__head--wing--4"></div>
      </div>

      <div class="rooster__neck">
        <div class="rooster__neck-s">
          <div class="rooster__neck--1 rooster__neck--l"></div>
          <div class="rooster__neck--1"></div>
          <div class="rooster__neck--1"></div>
          <div class="rooster__neck--1"></div>
          <div class="rooster__neck--1 rooster__neck--r"></div>
        </div>
        <div class="rooster__neck--curve"></div>
      </div>

      <div class="rooster__body">
        <div class="rooster__body--tb"></div>
        <div class="rooster__wing"></div>
      </div>

      <div class="rooster__tail rooster__tail--1"></div>
      <div class="rooster__tail rooster__tail--2"></div>

      <div class="rooster__leg rooster__leg--1">
        <div class="rooster__leg--line"></div>
        <div class="rooster__leg--hide"></div>
        <div class="rooster__leg--b"></div>
        <div class="rooster__leg--overlay"></div>
      </div>

      <div class="rooster__leg rooster__leg--2">
        <div class="rooster__leg--line"></div>
        <div class="rooster__leg--hide"></div>
        <div class="rooster__leg--b"></div>
        <div class="rooster__leg--overlay"></div>
      </div>

      <div class="surface"></div>
    </div>
  </body>

*,
*::after,
*::before {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}

:root {
  --color-bg: #f0693e;
  --color-1: #f3c074;
  --color-2: #753d22;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-color: var(--color-bg);
  overflow: hidden;
}

.rooster {
  position: relative;
  animation: body-ans 0.6s linear infinite;
}

.rooster__head {
  width: 3rem;
  height: 3rem;
  background-color: var(--color-2);
  margin-left: 1.5rem;
  --radius: 10rem;
  border-top-left-radius: var(--radius);
  border-bottom-left-radius: var(--radius);
}

.rooster__head--wing {
  --h: 1.6rem;
  --w: calc(var(--h) * 2);
  position: absolute;
  top: calc(var(--h) * -0.9);
  left: 1rem;
  width: var(--w);
  height: var(--h);
  border-radius: 0 0 4rem 4rem;
  border-left: 0.8rem solid #c71e24;
  background-color: #d52026;
  animation: ans-wing-1 0.4s infinite;
}

@keyframes ans-wing-1 {
  0%,
  100% {
    transform: rotate(0deg);
  }

  50% {
    transform: rotate(10deg);
  }
}

.rooster__head--wing--2 {
  --h: 2.8rem;
  --w: calc(var(--h) / 2);
  position: absolute;
  top: calc(var(--h) * -1);
  left: 2.8rem;
  width: var(--w);
  height: var(--h);
  border-radius: 0 4rem 4rem 0;
  background-color: #a21f21;
  border-right: 4px solid #991c1e;
  transform-origin: bottom;
  transform: rotate(-10deg);
  animation: ans-wing-2 0.4s ease-in-out infinite;
}

@keyframes ans-wing-2 {
  0%,
  100% {
    transform: rotate(-10deg);
  }

  50% {
    transform: rotate(-20deg);
  }
}

.rooster__head--wing--3 {
  --h: 1.2rem;
  --w: calc(var(--h) * 2);
  position: absolute;
  top: -0.4rem;
  left: 2.6rem;
  width: var(--w);
  height: var(--h);
  border-radius: 0 0 4rem 4rem;
  background-color: #a21f21;
  border-right: 4px solid #991c1e;
  transform-origin: bottom;
  --rotate: 15deg;
  transform: rotate(var(--rotate));
  animation: ans-wing-3 0.5s infinite;
}

.rooster__head--wing--4 {
  --h: 2.8rem;
  --w: calc(var(--h) / 2);
  position: absolute;
  top: calc(var(--h) * -0.9);
  left: 2.4rem;
  width: var(--w);
  height: var(--h);
  border-radius: 4rem 0 2rem 0;
  background-color: #d52026;
  border-right: 8px solid #c71e24;
  transform-origin: bottom;
  --rotate: 10deg;
  transform: rotate(var(--rotate));
  animation: ans-wing-3 0.4s infinite;
}

@keyframes ans-wing-3 {
  0%,
  100% {
    transform: rotate(var(--rotate));
  }

  50% {
    transform: rotate(calc(var(--rotate) + 15deg));
  }
}

.rooster__eyes {
  position: absolute;
  top: 0.3rem;
  left: 0.8rem;
  display: flex;
  align-items: center;
}

.rooster__eye {
  --s: 1.4rem;
  width: var(--s);
  height: var(--s);
  border-radius: 50%;
  background-color: #fff;
  position: relative;
  overflow: hidden;
}

.rooster__eye--1 {
  border: 4px solid var(--color-2);
  box-sizing: content-box;
}

.rooster__eye--2 {
  margin-left: -0.2rem;
}

.rooster__eye::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background-color: #000;
}

.rooster__eye-ans {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0%;
  left: 0;
  background-color: #753d22;
  transform: translateY(-70%);
  z-index: 2;
  animation: eye-ans 1.2s infinite;
}

.rooster__eye-ans--d {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0%;
  left: 0;
  background-color: #753d22;
  border-radius: inherit;
  transform: translateY(100%);
  z-index: 2;
  animation: eye-ans-d 1.2s infinite;
}

@keyframes eye-ans {
  0%,
  85%,
  100% {
    transform: translateY(-70%);
  }

  95% {
    transform: translateY(-40%);
  }
}

@keyframes eye-ans-d {
  0%,
  85%,
  100% {
    transform: translateY(100%);
  }

  95% {
    transform: translateY(40%);
  }
}

.rooster__mouth {
  position: absolute;
  width: 1.4rem;
  height: 0.9rem;
  left: 1rem;
  top: 2rem;
  border-radius: 50%;
  background-color: yellow;
  transform: rotate(2deg);
  z-index: 100;
}

.rooster__mouth-d {
  position: absolute;
  top: 2.97rem;
  left: 1.55rem;
  width: 0.9rem;
  height: 0.9rem;
  background-color: #991c1e;
  border-radius: 50%;
  z-index: 2;
  transform-origin: top;
  animation: mouth-ans 0.5s ease-in-out infinite;
}

.rooster__mouth-d--shadow {
  top: 2.97rem;
  left: 1.66rem;
  transform: scale(1.1);
  background-color: #7e0404;
}

.rooster__mouth-d::after {
  content: "";
  position: absolute;
  top: -0.1rem;
  left: 0.15rem;
  width: 0.4rem;
  height: 0.5rem;
  transform: rotate(35deg);
  background-color: #991c1e;
}

.rooster__mouth-d::before {
  content: "";
  position: absolute;
  top: -0.1rem;
  left: 0.35rem;
  width: 0.4rem;
  height: 0.5rem;
  transform: rotate(-35deg);
  background-color: #991c1e;
}

.rooster__mouth-d--shadow::after,
.rooster__mouth-d--shadow::before {
  background-color: #7e0404;
}

.rooster__mouth::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: 0.5rem;
  height: 0.8rem;
  border-top-right-radius: 5rem;
  border-bottom-right-radius: 5rem;
  border-right: 3px solid #fff;
  transform: rotate(-20deg);
  box-sizing: content-box;
}

.rooster__mouth::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 1rem;
  height: 1rem;
  border-radius: 1rem 0 0 0;
  border-top: 8px solid yellow;
  transform: translate(-40%, -6%) rotate(10deg);
}

@keyframes mouth-ans {
  0%,
  100% {
    transform: rotate(-10deg);
  }

  50% {
    transform: rotate(10deg);
  }
}

.rooster__neck {
  margin-top: -1rem;
  height: 8.7rem;
  width: 4.5rem;
  border-top-left-radius: 5rem;
  border-bottom-left-radius: 4rem;
  background-color: var(--color-2);
  position: relative;
  overflow: hidden;
}

.rooster__neck::after {
  content: "";
  position: absolute;
  left: 0;
  top: 48%;
  width: 100%;
  height: 1.2rem;
  border-right: 4px solid #ddaf68;
  border-left: 4px solid #ffd89e;
  background-color: var(--color-1);
  z-index: 11;
}

.rooster__neck-s {
  position: absolute;
  top: 3.5rem;
  left: -0.5rem;
  display: flex;
  gap: 0.1rem;
  z-index: 10;
}
.rooster__neck--l {
  background-image: linear-gradient(
    to bottom left,
    transparent 20%,
    #ffd89e 30%
  );
}

.rooster__neck--r {
  background-image: linear-gradient(
    to bottom left,
    #ddaf68 64%,
    transparent 64%
  );
}

.rooster__neck--1 {
  width: 1rem;
  height: 1rem;
  background-color: #f3c074;
  border-left: 4px solid #4e2816;
  border-top: 4px solid #4e2816;
  transform: rotate(45deg);
}

.rooster__neck--curve {
  position: absolute;
  top: 0.5rem;
  left: 0rem;
  width: 3rem;
  height: 4rem;
  border-left: 0.8rem solid #a3572eb7;
  transform: rotate(30deg);
  border-radius: 50%;
}

.rooster__body {
  --radius: 5rem;
  margin-top: -3.4rem;
  width: 10rem;
  height: 5rem;
  border-bottom-left-radius: var(--radius);
  border-bottom-right-radius: var(--radius);
  background-color: var(--color-1);
  border: 4px solid #ffd89e;
  border-top: transparent;
  position: relative;
  z-index: 10;
}

.rooster__body--tb {
  position: absolute;
  right: -4px;
  top: 0;
  width: 60.5%;
  height: 4px;
  background-color: #ddaf68;
}

.rooster__tail {
  --width: 4.5rem;

  position: absolute;
  width: var(--width);
  height: calc(var(--width) - 2rem);
  background-color: #d52026;
  right: 0;
  top: 40%;
  transform: translateX(60%);
  border-top-left-radius: calc(var(--width) - 1rem);
  border-top-right-radius: calc(var(--width) - 1rem);

  border-right: 6px solid #c91e24;
  border-left: 6px solid #d72229;
  transform-origin: left bottom;
  animation: tail-ans 0.5s ease-in-out infinite;
}

@keyframes tail-ans {
  0%,
  100% {
    transform: translateX(60%) rotate(0deg);
  }

  50% {
    transform: translateX(60%) rotate(10deg);
  }
}

.rooster__tail--1 {
  background-color: #991c1e;
  border-right: 6px solid #8d181c;
  border-left: 6px solid #a11e22;
  right: 1.2rem;
  top: 45%;
  transform-origin: left;
  transform: translateX(60%) rotate(-45deg);
  animation: tail-1-ans 0.5s ease-in-out infinite;
}

@keyframes tail-1-ans {
  0%,
  100% {
    transform: translateX(60%) rotate(-45deg);
  }

  50% {
    transform: translateX(60%) rotate(-35deg);
  }
}

.rooster__wing {
  position: absolute;
  left: 36%;
  top: 1%;
  transform: rotate(10deg);
  width: 7rem;
  height: 3.4rem;
  background-color: #753d22;
  border-radius: 2rem 0 3.5rem 2rem;
  border-right: 8px solid #6e3a20;
  border-left: 8px solid #7c4024;
  transform-origin: top left;
  animation: wing-ans 1s linear infinite;
}

@keyframes wing-ans {
  0%,
  40%,
  100% {
    transform: rotate(10deg);
  }

  20%,
  60% {
    transform: rotate(18deg);
  }

  80% {
    transform: rotate(2deg);
  }
}

.rooster__leg {
  position: absolute;
  left: 36%;
  bottom: -9%;
  width: 4.2rem;
  height: 2.4rem;
  background-color: #60321c;
  border-radius: 0 0 4rem 4rem;
}

.rooster__leg--line {
  position: absolute;
  top: 40%;
  left: 35%;
  height: 4rem;
  width: 0.8rem;
  overflow: hidden;
  transform: rotate(2deg);
  z-index: -1;
}

.rooster__leg--line::before {
  content: "";
  position: absolute;
  top: -4rem;
  left: 0rem;
  --s: 12rem;
  width: var(--s);
  height: var(--s);
  background-color: yellow;
  border-radius: 50%;
}

.rooster__leg--line::after {
  content: "";
  position: absolute;
  top: -5.5rem;
  left: 0.5rem;
  --s: 15rem;
  width: var(--s);
  height: var(--s);
  background-color: rgb(228, 228, 13);
  border-radius: 50%;
}

.rooster__leg--hide {
  content: "";
  position: absolute;
  top: -5.5rem;
  left: 0.8rem;
  --s: 15rem;
  width: var(--s);
  height: var(--s);
  border-left: px solid rgb(228, 228, 13);
  border-radius: 50%;
  z-index: 1;
}

.rooster__leg--b {
  position: absolute;
  top: 4.6rem;
  left: 0rem;
  width: 3rem;
  height: 0.4rem;
  background-color: yellow;
  border-radius: 0.4rem;
  z-index: 100;
  animation: leg-b-ans 1s infinite;
}

.rooster__leg--1 {
  animation: leg-ans 1s linear infinite;
}

.rooster__leg--1 .rooster__leg--overlay {
  background-color: #60321c;
}

.rooster__leg--2 {
  animation: leg-ans 1s 0.6s linear infinite;
}

.rooster__leg--2 .rooster__leg--overlay {
  background-color: #753d22;
}

@keyframes leg-ans {
  0%,
  100% {
    transform: translate(0, 0);
  }

  20% {
    transform: translate(-0.5, -0.6rem);
  }

  40% {
    transform: translate(-1rem, -0.6rem);
  }

  70% {
    transform: translate(-2rem, 0rem);
  }
}

@keyframes leg-b-ans {
  0%,
  100% {
    transform: rotate(0);
  }

  20% {
    transform: rotate(4deg);
  }

  40% {
    transform: rotate(-4deg);
  }

  70% {
    transform: rotate(4deg);
  }
}

@keyframes body-ans {
  0%,
  100% {
    transform: translateY(0, 0);
  }

  50% {
    transform: translateY(-0.4rem);
  }
}

.rooster__leg--overlay {
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: var(--color-2);
  border-radius: inherit;
}

.surface {
  position: absolute;
  top: 15.8rem;
  left: -5rem;
  width: 20rem;
  height: 1rem;
  border-radius: 50%;
  background-color: rgba(0, 0, 0, 0.259);
  animation: surface-ans 1s linear infinite;
  z-index: -1;
}

@keyframes surface-ans {
  0%,
  100% {
    transform: scaleX(1);
  }

  50% {
    transform: scaleX(1.1);
  }
}

This Pen is owned by Md Usman Ansari on CodePen.

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