Read the given statements and conclusions carefully. Assuming that the information given in the statements true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.

Statements:

No crow is a pigeon.

All sparrows are crows.

Some sparrows are birds.

Conclusions:

I. No sparrow is a pigeon.

II. No bird is a pigeon.

III. Some crows are birds.