abstract class Tier
    {
     public $Name;
     public $Fellfarbe;
     public $KrallenLaenge;
     public $AnzahlBeine;

     public function gibNamenAus()
     {
      echo "Ich heiße ".$this->name."\n";
     }
    }
    class Hund extends Tier
    {
     public $GefangeneKatzen;
     public function gibLaut()
     {
      echo "Wau\n";
     }
    }
    class Katze extends Tier {
     public $GefangeneVoegel;
     public function gibLaut()
     {
      echo "Miau\n";
     }
    }
    class Amsel extends Tier
    {
     public $GefangeneInsekten;
     public function gibLaut()
     {
      echo "Piep";
     }
    }