diff --git a/exercise/01/animal.cpp b/exercise/01/animal.cpp
new file mode 100644
index 0000000..f55a8ab
--- /dev/null
+++ b/exercise/01/animal.cpp
@@ -0,0 +1,73 @@
+#include "animal.h"
+
+std::wstring cockroach::species() const
+{
+	return L"cockroach";
+}
+
+unsigned int cockroach::legs() const
+{
+	return 6u;
+}
+
+cockroach::~cockroach(){ }
+
+std::wstring sparrow::species() const
+{
+	return L"sparrow";
+}
+
+unsigned int sparrow::legs() const
+{
+	return 2u;
+}
+
+sparrow::~sparrow(){ }
+
+std::wstring tarantula::species() const
+{
+	return L"tarantula";
+}
+
+unsigned int tarantula::legs() const
+{
+	return 8u;
+}
+
+tarantula::~tarantula() { }
+
+
+animal_factory::animal_factory(int id)
+{
+	this->id = id;
+	create_animal();
+}
+
+animal* animal_factory::create_animal() const
+{
+	switch (id)
+	{
+	case 1: return new cockroach;
+		break;
+	case 2: return new sparrow;
+		break;
+	case 3: return new tarantula;
+		break;
+	default: return nullptr;
+		break;
+	}
+}
+
+std::wstring leg_counter::add_animal(animal_factory& af)
+{
+	animal* a = af.create_animal();
+	counter += a->legs();
+	std::wstring species = a->species();
+	delete a;
+	return species;
+}
+
+unsigned int leg_counter::legs() const
+{
+	return counter;
+}
\ No newline at end of file
diff --git a/exercise/01/animal.h b/exercise/01/animal.h
new file mode 100644
index 0000000..558c756
--- /dev/null
+++ b/exercise/01/animal.h
@@ -0,0 +1,57 @@
+#pragma once
+#include <string>
+
+class animal
+{
+public:
+	virtual std::wstring species() const = 0;
+	virtual unsigned int legs() const= 0;
+	virtual ~animal() {};
+};
+
+class insect : public animal {};
+
+class cockroach : public insect
+{
+	std::wstring species() const override;
+	unsigned int legs() const override;
+public:
+	~cockroach();
+};
+
+class bird : public animal { };
+
+class sparrow : public bird
+{
+	std::wstring species() const override;
+	unsigned int legs() const override;
+public:
+	~sparrow();
+};
+
+class spider : public animal {};
+
+class tarantula : public spider
+{
+	std::wstring species() const override;
+	unsigned int legs() const override;
+public:
+	~tarantula();
+};
+
+class animal_factory
+{
+public:
+	animal_factory(int id);
+	animal* create_animal() const;
+private:
+	int id;
+};
+
+class leg_counter 
+{
+	unsigned int counter = 0;
+public:
+	std::wstring add_animal(animal_factory&);
+	unsigned int legs() const;
+};
diff --git a/exercise/01/animals.vcxproj b/exercise/01/animals.vcxproj
index 0c14cbf..42f52e7 100644
--- a/exercise/01/animals.vcxproj
+++ b/exercise/01/animals.vcxproj
@@ -82,13 +82,13 @@
       <AdditionalLibraryDirectories>$(VCInstallDir)UnitTest\lib;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
     </Link>
   </ItemDefinitionGroup>
-  <ItemGroup>
-    <ClInclude Include="animal.h" />
-  </ItemGroup>
   <ItemGroup>
     <ClCompile Include="animal.cpp" />
     <ClCompile Include="test.cpp" />
   </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="animal.h" />
+  </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
diff --git a/exercise/01/animals.vcxproj.user b/exercise/01/animals.vcxproj.user
new file mode 100644
index 0000000..be25078
--- /dev/null
+++ b/exercise/01/animals.vcxproj.user
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup />
+</Project>
\ No newline at end of file