<div class="demo"> 
	<img src="https://png.icons8.com/ios/540/pig-filled.png"> 
    <img src="https://png.icons8.com/ios/540/cat-filled.png"> 
    <img src="https://png.icons8.com/ios/540/bull-filled.png"> 
    <img src="https://png.icons8.com/ios/540/chicken-filled.png"> 
    <img src="https://png.icons8.com/ios/540/dog-filled.png"> 
</div>

.demo {
	width: 120px;
	height: 120px;
	border: 1px solid;
	position:relative;
	overflow:hidden;
}
.demo img {
	position:absolute;
	left:0;right:0;top:0;
	bottom:0;
	margin:auto;
	width: 120px;
	height:120px;
	overflow:hidden;
 	transform:scale(0);
	animation: anim 1s forwards;
}
.demo img:nth-child(2) {animation-delay: 1s;}
.demo img:nth-child(3) {animation-delay: 2s;}
.demo img:nth-child(4) {animation-delay: 3s;}
.demo img:nth-child(5) {animation-delay: 4s;}
@keyframes anim {
 50%{transform:scale(1)}
}