Atlantic puffins have the ability to carry several fish in their beaks at one time. They push the fish to the back of their mouth with their tongue, where ridges at the top of their bill secure the fish in place. This allows puffins to keep their mouth open to catch more fish without losing any in the process. In general, they can hold around 10 fish in their beak at once. The chick stays in the burrow until it is able to fly. The young puffin uses a toilet area towards the front of the burrow away from the nest to stay clean.