In the following question, two statements are followed by four conclusions. All dogs are animals

In the following question, two statements are followed by four conclusions. you have to assume the given statements to be true, even if they seem to be at variance with commonly known facts. Read both the conclusions and then decide which of the given conclusions logically follows from the Statements.
Statements:
All dogs are animals
No animals are birds
Conclusions:
I. Some dogs are birds
II. No dog is bird
III. some birds are dogs
IV. All animals are dogs