Read the given statements and conclusions carefully. Assuming that the information given in the statements is 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 :

All snakes are crocodiles.

All crocodiles are turtles

All birds are crocodiles.

Conclusions : 

I. All snake are turtles.

II. All birds are turtles.

III. Some snakes are birds.