Cat senses roof of their mouths called the vomeronasal (or Jacobson's) organ. When a cat wrinkles its muzzle, lowers its chin, and lets its tongue hang a bit, it is opening the passage to the vomeronasal. This is called "gaping", "sneering", "snake mouth", or "flehming". Gaping is the equivalent of the Flehmen response in other animals, such as dogs, horses and big cats. A cat has about twenty-four movable vibrissae ("whiskers"), in four sets on each upper lip on either side of its nose (some cats may have more). There are also a few on each cheek, tufts over the eyes, bristles
Chester Rows has been blocked by enclosure or by new buildings, but in others modern buildings have retained the Rows in their designs. Undercrofts or "crypts" were constructed beneath the buildings in the Rows. The undercrofts were in stone while most of the buildings in the Rows were in timber. Today about 20 of the stone undercrofts still exist, but at the level of the Rows very little medieval fabric remains. Many of the buildings containing portions of the Rows are listed and some are recorded in the English Heritage Archive. The premises on the street and Row levels are used for