diff --git a/src/tutorial/class/animal.py b/src/tutorial/class/animal.py
new file mode 100644
index 0000000..77a7406
--- /dev/null
+++ b/src/tutorial/class/animal.py
@@ -0,0 +1,32 @@
+from abc import ABC, abstractmethod
+
+
+class Animal(ABC):
+    @abstractmethod
+    def speak(slef) -> str:
+        return "..."
+
+    def chorus(self, n: int) -> str:
+        # Wiederhole den Laut n-mal als eine Zeile"
+        if n <= 0:
+            raise ValueError("n muss positiv sein")
+        return " ".join(self.speak() for _ in range(n))
+
+
+class Dog(Animal):
+    def speak(self) -> str:
+        return "wuff"
+
+
+class Cat(Animal):
+    def speak(self) -> str:
+        return "miau"
+
+
+class Cow(Animal):
+    def speak(self) -> str:
+        return "muh"
+
+
+cow = Cow()
+print(cow.chorus(3))