I want to persist my litte zoo with Hibernate:

@Entity
@Table(name = "zoo") 
public class Zoo {
    @OneToMany
    private Set<Animal> animals = new HashSet<Animal>();
}

// Just a marker interface
public interface Animal {
}

@Entity
@Table(name = "dog")
public class Dog implements Animal {
    // ID and other properties
}

@Entity
@Table(name = "cat")
public class Cat implements Animal {
    // ID and other properties
}

When I try to persist the zoo, Hibernate complains:

Use of @OneToMany or @ManyToMany targeting an unmapped class: blubb.Zoo.animals[blubb.Animal]

I know about the targetEntity-property of @OneToMany but that would mean, only Dogs OR Cats can live in my zoo.

Is there any way to persist a collection of an interface, which has several implementations, with Hibernate?