header {
  background: #31aab8 url("../projects/critter/header_mobile.jpg") no-repeat left top; }
  @media only screen and (min-width: 601px) {
    header {
      background-image: url("../projects/critter/header_medium.jpg"); } }
  @media only screen and (min-width: 901px) {
    header {
      background-image: url("../projects/critter/header.jpg"); } }

.critterStates img {
  max-width: 33%; }