diff --git a/16_Bug/csharp/Parts/Body.cs b/16_Bug/csharp/Parts/Body.cs
index 2b7586dc..58f80405 100644
--- a/16_Bug/csharp/Parts/Body.cs
+++ b/16_Bug/csharp/Parts/Body.cs
@@ -28,14 +28,17 @@ internal class Body : ParentPart
 
     public void AppendTo(StringBuilder builder, char feelerCharacter)
     {
-        _neck.AppendTo(builder, feelerCharacter);
-        builder
-            .AppendLine("     BBBBBBBBBBBB")
-            .AppendLine("     B          B")
-            .AppendLine("     B          B");
-        _tail.AppendTo(builder);
-        builder
-            .AppendLine("     BBBBBBBBBBBB");
-        _legs.AppendTo(builder);
+        if (IsPresent)
+        {
+            _neck.AppendTo(builder, feelerCharacter);
+            builder
+                .AppendLine("     BBBBBBBBBBBB")
+                .AppendLine("     B          B")
+                .AppendLine("     B          B");
+            _tail.AppendTo(builder);
+            builder
+                .AppendLine("     BBBBBBBBBBBB");
+            _legs.AppendTo(builder);
+        }
     }
 }
diff --git a/16_Bug/csharp/Parts/Head.cs b/16_Bug/csharp/Parts/Head.cs
index 3bab7caa..d7135575 100644
--- a/16_Bug/csharp/Parts/Head.cs
+++ b/16_Bug/csharp/Parts/Head.cs
@@ -23,13 +23,16 @@ internal class Head : ParentPart
 
     public void AppendTo(StringBuilder builder, char feelerCharacter)
     {
-        _feelers.AppendTo(builder, feelerCharacter);
-        builder
-            .AppendLine("        HHHHHHH")
-            .AppendLine("        H     H")
-            .AppendLine("        H O O H")
-            .AppendLine("        H     H")
-            .AppendLine("        H  V  H")
-            .AppendLine("        HHHHHHH");
+        if (IsPresent)
+        {
+            _feelers.AppendTo(builder, feelerCharacter);
+            builder
+                .AppendLine("        HHHHHHH")
+                .AppendLine("        H     H")
+                .AppendLine("        H O O H")
+                .AppendLine("        H     H")
+                .AppendLine("        H  V  H")
+                .AppendLine("        HHHHHHH");
+        }
     }
 }
diff --git a/16_Bug/csharp/Parts/Neck.cs b/16_Bug/csharp/Parts/Neck.cs
index e8976c1c..23dacfb7 100644
--- a/16_Bug/csharp/Parts/Neck.cs
+++ b/16_Bug/csharp/Parts/Neck.cs
@@ -24,7 +24,10 @@ internal class Neck : ParentPart
 
     public void AppendTo(StringBuilder builder, char feelerCharacter)
     {
-        _head.AppendTo(builder, feelerCharacter);
-        builder.AppendLine("          N N").AppendLine("          N N");
+        if (IsPresent)
+        {
+            _head.AppendTo(builder, feelerCharacter);
+            builder.AppendLine("          N N").AppendLine("          N N");
+        }
     }
 }
diff --git a/16_Bug/csharp/Parts/Tail.cs b/16_Bug/csharp/Parts/Tail.cs
index 8c450f1d..ebf4b28f 100644
--- a/16_Bug/csharp/Parts/Tail.cs
+++ b/16_Bug/csharp/Parts/Tail.cs
@@ -10,5 +10,11 @@ internal class Tail : Part
     {
     }
 
-    public void AppendTo(StringBuilder builder) => builder.AppendLine("TTTTTB          B");
+    public void AppendTo(StringBuilder builder)
+    {
+        if (IsPresent)
+        {
+            builder.AppendLine("TTTTTB          B");
+        }
+    }
 }
\ No newline at end of file