@startuml
skin rose
skinparam BackgroundColor transparent
skinparam GenericDisplay old
skinparam Shadowing false
hide empty members

together {
class "List<Animal>" as list_animal {
    + Animal this[int index] {method}
    + void Add(Animal)
    + void RemoveAt(int index)
    - Animal[] entries
}
class "List<Dog>" as list_dog {
    + Dog this[int index] {method}
    + void Add(Dog)
    + void RemoveAt(int index)
    - Dog[] entries
}
class "List<Cat>" as list_cat {
    + Cat this[int index] {method}
    + void Add(Cat)
    + void RemoveAt(int index)
    - Cat[] entries
}
}

interface "IReadOnlyList<Dog>" as ro_list_dog {
    + Dog this[int index] {method}
}
interface "IReadOnlyList<Animal>" as ro_list_animal {
    + Animal this[int index] {method}
}
interface "IReadOnlyList<Cat>" as ro_list_cat {
    + Cat this[int index] {method}
}

ro_list_dog <|-- list_dog
ro_list_animal <|-- list_animal
ro_list_cat <|-- list_cat
ro_list_animal <|-[#blue]- ro_list_dog
ro_list_animal <|-[#blue]- ro_list_cat

@enduml