Q
                         ___________________/ \___________________
                        /                                         \
                       Q                         __________________Q
                      / \                       /                   \
                     Q   fish                  Q            _________Q
                    / \                       / \          /          \
         __________Q   cow                 dog   cat      Q            Q
        /           \                                    / \          / \
       Q             Q                                  Q   wolf sheep   horse
      / \           / \                                / \
walrus   badger seal   Q________________      wolverine   frog
                      /                 \   
                     Q                   Q  
                    / \                 / \  
                   Q   hampster   ocolot   Q        
                  / \                     / \        
           pegasus   Q              gerbil   platypus
                    / \         
             axolotl   unicorn