C++11 vector of smart pointer

Suppose we have the following codes. We have following classes

• Animal as AbstractClass


• Dog and Bird which is subclass of Animal


• Zoo which keeps all animals

_

class Animal
{
public:
    Animal();
    void HasWings() = 0;
};

class Bird : public Animal
{
public:
    Bird() : Animal() {}
    void HasWings() override { return true; }
};

class Dog : public Animal
{
public:
    Dog() : Animal() {}
    void HasWings() override { return false; }
};

class Zoo
{
public:
    Zoo() {}
    void AddAnimal(Animal* animal) { _animals.push_back(animal); }
    ...
    std::vector<Animal*> _animals;
};

void myTest()
{
    Zoo myZoo;
    Bird* bird = new Bird();
    Dog* dog = new Dog();

    myZoo.AddAnimal(bird);
    myZoo.AddAnimal(dog);

    for (auto animal : myZoo._animals)
    {
        ...
    }
    ...
}

I hope to replace vector of pointers by vector of smart pointers. i.e,

std::vector<std::shared_ptr<Animal>> _animals;

How do we change the code for Zoo and myTest? I find difficulty on updating the code, especially the method "AddAnimal" in Zoo class

auto bird = std::make_shared<Bird>();
auto dog = std::make_shared<Dog>();
myZoo.AddAnimal(bird);
myZoo.AddAnimal(dog);

bird and dog are different type