A CodePen by SergSlon. Cute CSS3-only animals - Just a fun CSS3 demo as an exercise to use the CSS clip:rect(); property.

index.html

<div class="wrapper">
<div class="cat animal">
  <div class="head">
    <span class="nose"></span>
    <div class="ears"></div>
    <div class="stripes stripes-right"></div>
    <div class="stripes stripes-left"></div>
    <div class="tongue"></div>
  </div>
  <div class="body">
    <span class="stripes"></span>
  </div>
  <div class="tail"></div>
</div>
</div>
<div class="wrapper">
<div class="butterfly animal">
  <div class="butterfly-antennas"></div>
  <div class="b-body"></div>
  <div class="butterfly-right-wing"></div>
  <div class="butterfly-left-wing"></div>
</div>
</div>
<div class="wrapper">
<div class="bee animal">
  <div class="bee-antennas"></div>
  <div class="bee-body">
    <div class="bee-eyes"></div>
    <div class="bee-mouth"></div>
  </div>
  <div class="bee-right-wing"></div>
  <div class="bee-left-wing"></div>
</div>
</div>
<div class="wrapper">
<div class="parrot animal">
  <div class="beak"></div>
  <div class="parrot-tail"></div>
</div>
</div>
<div class="wrapper">
  <div class="bear animal">
    <div class="bear-head">
      <div class="bear-eyes"></div>
      <div class="bear-face"></div>
    </div>
    <div class="bear-body">
      <div class="bear-hands"></div>
    </div> 
  </div>
</div>

script.js

/*
The code is a little messed up because each of 
these cuties was in its own demo page
so the widths and heights aren't the same
for all of them.


Me on twitter: @SaraSoueidan

Cute animals designed by talented Eva Galesloot from Dribbble (@skwirrol)

Thanks @ fabrice Weinberg for the Cat and Butterfly hover effects ^_^

*/

style.css

.wrapper{
  float:left;
  width:250px;
  margin:50px 0px;
}
/*============================================
BEE
==============================================
*/
.bee{
  width:200px;
  position:relative;
  margin-left:80px;
}
.bee-body{
  width:100px;
  height:170px;
  border-radius:50px;
  background-color: #392315;
  position:relative;
}
.bee-body:before{
  display:block;
  content:"";
  position:absolute;
  bottom:40px;
  width:100px;
  height:20px;
  border-top: 20px solid #FDDF41;
  border-bottom: 20px solid #FDDF41;
}
.bee-body:after{
  display:block;
  content:"";
  position:absolute;
  bottom:-19px;
  width:0;
  left:50%;
  margin-left:-5px;
  height:0;
  border-top:20px solid #392315;
  border-right: 5px solid transparent;
  border-left: 5px solid transparent;
}
.bee-eyes:before, .bee-eyes:after{
  content:"";
  display:block;
  position:absolute;
  top:20px;
  width:10px;
  height:10px;
  border: 6px solid white;
  border-radius: 50%;
}
.bee-eyes:before{
  left:22px;
}
.bee-eyes:after{
  right:22px;
}
.bee-mouth{
  position:absolute;
  width:15px;
  height:15px;
  border-radius: 50%;
  clip: rect(10px, 30px, 30px ,0);
  border: 3px solid white;
  top:37px;
  left:40px;
}
.bee-antennas{
  position:Absolute;
  width:30px;
  height:30px;
  top:-25px;
  left:33px;
  border-right: 2px solid #3B200D;
  border-left: 2px solid #3B200D;
  
}

.bee-antennas:before, .bee-antennas:after{
  display:block;
  content:"";
  height:10px;
  width:10px;
  border-radius:50%;
  background-color: #392315;
  position:absolute;
  top:-9px;
}
.bee-antennas:before{
  left:-6px;
}
.bee-antennas:after{
  right:-6px;
}
.bee-right-wing, .bee-left-wing{
  position:absolute;
  width:70px;
  height:70px;
  background-color: #BDE3E6;
  z-index:-2;
  border-radius:50%;
}
.bee-right-wing{
  bottom:-5px;
  right:30px;
  
}
.bee-left-wing{
  bottom:-5px;
  left:-70px;
}
.bee-right-wing:before, .bee-left-wing:before{
  content:"";
  display:block;
  position:absolute;
  width:0; height:0;
  border-top: 60px solid #BDE3E6;
  border-right: 30px solid transparent;
  border-left: 30px solid transparent;
  transform: rotate(154deg);
  top:-38px;
  left:-16px;
}
.bee-left-wing:before{
  transform: rotate(-154deg);
  top:-38px;
  left:26px;
}
.bee-right-wing:after{
  content:"";
  display:block;
  width:150%;
  border-top: 2px solid white;
  border-bottom:2px solid white;
  height:20px;
  transform: rotate(40deg);
  position:absolute;
  left:-20px;
  top:15px;
}
.bee-left-wing:after{
  content:"";
  display:block;
  width:150%;
  border-top: 2px solid white;
  border-bottom:2px solid white;
  height:20px;
  transform: rotate(-40deg);
  position:absolute;
  right:-20px;
  top:15px;
}
/*
===================================
THE CAT
===================================
*/
.cat{
  position:relative;
  width:200px;
  margin-left:50px;
}
.cat:hover .tongue{
  height:18px;
}

.head{
  width:150px;
  height:90px;
  border-radius: 75px 75px 0 0;
  background-color: #B09D7C;
  position:relative;
  box-shadow: 
    inset 0 -3px 5px rgba(0,0,0,0.1);
}
.head:before, .head:after{/*the eyes*/
  content:"";
  display:block;
  position:absolute;
  top: 35px;
  width:15px;
  height:15px;
  background-color: #3B1F11;
  border-radius:50%;
  border:8px solid white;
}
.head:before{
  left:30px;
  box-shadow: 20px 20px 0 -8px #D9D1BA;
  z-index:1;
}
.head:after{
  left:85px;
  box-shadow: -20px 20px 0 -8px #D9D1BA;
}
.nose{
  display:block;
  position: absolute;
  width:0;
  height:0;
  border-top: 7px solid #402617;
  border-right: 6px solid transparent;
  border-left: 6px solid transparent;
  top:63px;
  left:67px;
  z-index:1;
}
.nose:before{
  content:"";
  display:block;
  position:absolute;
  width:0; height:0;
  border-top: 25px solid #351B0A;
  border-right: 5px solid transparent;
  border-left: 5px solid transparent;
  top:-70px;
  left: -5px;
}
.ears:before, .ears:after{
  content:"";
  display:block;
  background-color: #D9D1BA;
  border: 5px solid #B09D7C;
  border-radius:  0  0 25px 25px;
  width:70px; height:15px;
  position:absolute;
  z-index:-1;
}
.ears:after{
  right:-10px;
  top: 20px;
  transform: rotate(-50deg);
}
.ears:before{
  left:-10px;
  top:20px;
  transform: rotate(50deg);
}
.tongue{
  position:absolute;
  top:66px;
  left:68px;
  width:10px;
  background:#D68;
  border-radius:0 0 5px 5px;
  z-index:0; 
}
.body{
  position:absolute;
  width: 150px;
  height:200px;
  background-color: #CABC9F;
  top:83px;
  left:-6px;
  border-radius: 100px;
  z-index:-1;
  clip: rect(0, 150px, 90px, 80px);
  box-shadow: inset 0 0 0 40px #B09D7C;
}
.body:before, .body:after{
  content:"";
  display:block;
  border-radius: 50%;
  background-color: #928366;
  height:12px;
  width:12px;
  position: absolute;
  top: 83px;
}
.body:before{
  right:58px;
}
.body:after{
  right: 43px;
}
.tail{
  height:90px;
  width:50px;
  position:absolute;
  top:83px;
  right:6px;
  border-radius: 35px 0 35px 0;
  background-color: #9C8D70;
}
.tail:before, .tail:after{
  content:"";
  display:block;
  position:absolute;
  width:0; height:0;
  border-top: 25px solid #351B0A;
  border-right: 6px solid transparent;
  border-left: 6px solid transparent;
  transform: rotate(90deg);
  right:7px;
}
.tail:before{
  top:10px;
}
.tail:after{
  top:40px;
}
.stripes:before, .stripes:after{
  content:"";
  display:block;
  position:absolute;
  width:0; height:0;
  border-top: 25px solid #351B0A;
  border-right: 6px solid transparent;
  border-left: 6px solid transparent;
  transform: rotate(45deg);
  right:25px;
  top:19px;
}
.stripes:after{
  top: 40px;
  right:11px;
  transform: rotate(65deg);
}
.stripes-left:before, .stripes-left:after{
  transform: rotate(-80deg);
  left:8px;
  top:50px;
}
.stripes-left:after{
  top:70px;
  left:6px;
  transform: rotate(-90deg);
}
.stripes-right:before{
  transform: rotate(80deg);
  right:8px;
  top:50px;
}
.stripes-right:after{
  top:70px;
  right:6px;
  transform: rotate(90deg);
}
/*============================================
BUTTERFLY 
=============================================
*/
.butterfly{
  width:150px;
  position:relative;
}
.butterfly:hover .b-body:after,
.butterfly:hover .b-body:before{
  top:11px;
  height:2px;
}
.butterfly-antennas{
  z-index:-1;
  position:absolute;
  top:-10px;
  left:70px;
  width:5px;
  height:12px;
  border-right: 2px solid black;
  border-left:2px solid black;
 
}
.butterfly-antennas:before, .butterfly-antennas:after{
  position:absolute;
  content:"";
  display:block;
  width:7px;
  height:7px;
  top:-4px;
  background-color: black;
  border-radius: 50%;
}
.butterfly-antennas:before{
  left:-7px;
}
.butterfly-antennas:after{
  right: -7px;
}
.b-body{
  margin:0px auto;
  height:95px;
  width:22px;
  border-radius: 15px;
  background-color: #FDD537;
  background: linear-gradient(#FDD537 50%, #F2AA31 50%);
  background-size:22px 40px;
  position:relative;
}
.b-body:before, .b-body:after{
  content:"";
  position:absolute;
  display:block;
  height:5px; width:5px;
  border-radius: 50%;
  background-color: black;
  top:10px;
  transition: all .1s linear;
}
.b-body:before{
  left:5px;
}
.b-body:after{
  right:5px;
}
.butterfly-right-wing{
  position:absolute;
  z-index:-1;
  background-color: #4ABBDD;
  width:60px;
  height:60px;
  top:-10px;
  right:5px;
  border-radius: 50% 50% 50% 0;
}
.butterfly-left-wing{
  position:absolute;
  z-index:2;
  background-color: #4ABBDD;
  width:60px;
  height:60px;
  top:-10px;
  left:5px;
  border-radius: 50% 50% 0 50%;
}
.butterfly-right-wing:after{
  position:absolute;
  content:"";
  display:block;
  height: 15px; width:15px;
  border:5px solid #A6DBEB;
  border-radius:50%;
  background-color: #276F7D;
  top:10px;
  right:15px;
  box-shadow: 
    -15px 20px 0 -6px #A4DDEE,
    -10px 60px 0 -2px #A4DDEE;
}
.butterfly-left-wing:after{
  position:absolute;
  content:"";
  display:block;
  height: 15px; width:15px;
  border:5px solid #A6DBEB;
  border-radius:50%;
  background-color: #276F7D;
  top:10px;
  left:15px;
  box-shadow: 
    15px 20px 0 -6px #A4DDEE,
    10px 60px 0 -2px #A4DDEE;
}
.butterfly-right-wing:before{
  content:"";
  display:block;
  position:absolute;
  background-color: #4ABBDD;
  width:45px;
  height:45px;
  top:98%;
  left:0;
  border-radius: 0 50% 50%  50%;
}
.butterfly-left-wing:before{
  content:"";
  display:block;
  position:absolute;
  background-color: #4ABBDD;
  width:45px;
  height:45px;
  top:98%;
  right:0;
  border-radius:  50% 0 50%  50%;
}
/*==========================================
PARROT
============================================
*/
.parrot{
  width:150px;
  height:150px;
  margin-left:50px;
  background-color: #8CBC42;
  border-radius: 0 50%;
  position:relative;
}
.parrot:before{
  content:"";
  position:absolute;
  top:20px;
  left:20px;
  height:15px;
  width:15px;
  background-color: #3F6C2B;
  border-radius: 50%;
  border: 10px solid white;
}
.parrot:after{
  content:"";
  display:block;
  position:absolute;
  bottom:0;
  right:0;
  background-color: #3F6C2B;
  height:80px;
  width:80px;
  border-radius: 0 50%;
}
.beak{
  position:absolute;
  top:0;
  left:-40px;
  width:80px;
  height:50px;
  background-color:#FCAC39;
  border-radius: 50px 0;
  z-index:-1;
}
.beak:after{
  content:"";
  display:block;
  width:50px;
  height:25px;
  position:Absolute;
  top:99%;
  right:40%;
  margin-right:-25px;
  background-color: #E99138;
  border-radius: 0 25px;
  animation: open .5s linear infinite;
  animation-play-state: paused;
}
.parrot:hover .beak:after{
  animation-play-state: running;
}
@keyframes open{
  50%{transform: rotate(-45deg);}
}
.parrot-tail{
  width:30px;
  height:40px;
  position:absolute;
  top:100%;
  right:-15px;
  background-color: #8CBC42;
  border-radius: 50%;
  clip: rect(-15px,  80px, 40px ,15px);
}
.parrot-tail:after{
  content:"";
  position:absolute;
  top:-15px;
  right:-25px;
  width:40px;
  height:30px;
  border-radius: 50%;
  background-color: #8CBC42;
  clip: rect(0, 40px , 15px, 0);
}
/*============================================
BEAR
==============================================
*/
.bear{
  margin:0 auto;
  height:200px;
  position:relative;
  width:150px;
}
.bear-head{
  width:130px;
  height:100px;
  border-radius: 47%;
  background-color: #E39F58;
  position:relative;
}
.bear-face{
  background-color: #FCB96A;
  position:absolute;
  width:65px;
  height:30px;
  border-radius: 30px 30px 10px 10px;
  bottom:5px;
  left:33px;
}
.bear-face:before{
  width:20px;
  height:10px;
  border-radius: 2px 2px 10px 10px;
  position:absolute;
  content:"";
  left:22px;
  display:block;
  background-color: #4B2D0B;
}
.bear-face:after{
  width:7px;
  height:5px;
  content:"";
  display:block;
  position:absolute;
  top:15px;
  left:29px;
  background-color: #F24B1F;
  border-radius: 0 0 5px 5px;
}
.bear-head:before, .bear-head:after{
  content:"";
  display:block;
  background-color: #FCB96A;
  border-radius:50%;
  border:10px solid #E39F58;
  width:10px;
  height:10px;
  position:absolute;
  top:-8px;
}
.bear-head:after{
  right:0;
}
.bear-body{
  position:absolute;
  width:75px;
  height:80px;
  top:40px;
  background-color: #F9B667;
  left:28px;
  z-index:-1;
  border-radius: 50% 50% 5% 5%;
  box-shadow: inset 0 50px 0 15px #E29E57;
}
.bear-body:before, .bear-body:after, .bear-hands:before, .bear-hands:after{
  background-color:#CB8B4D;
  content:"";
  display:block;
  position:absolute;
  height:10px;
  width:20px;
  border-radius:0 0 10px 10px;
  bottom:-9px;
}
.bear-hands:before, .bear-hands:after{
  top:58px;
}
.bear-hands:before{
  left:-15px;
  transform:rotate(90deg);
}
.bear-hands:after{
  right: -15px;
  transform:rotate(-90deg);
}
.bear-body:before{
   left:2px;
}
.bear-body:after{
  right:2px;
}
.bear-eyes:before, .bear-eyes:after{
  content:"";
  display:block;
  background-color: #3B1F14;
  height:12px; width:12px;
  border:7px solid white;
  border-radius:50%;
  position:absolute;
  top:37px;
  left:27px;
}
.bear-eyes:after{
  left:75px;
}