definite article - (The?) Lions in the zoo are very aggressive

We use a plural count noun with no article if we mean all or any of that thing. For example:

Lions are very aggressive.

I don't like lions.

We only use the with general plural nouns when we are referring to a specific set within a general class of people or things. For example:

Books are so important in my life. (I mean all books in general.)

The books were all over the floor. (I mean specific books that you and I know.)

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Let's say you and I are living in New York. There is only one zoo in NY. You and I know about that zoo but we have never been there.

Should I say

Lions in the zoo are very aggressive. (Lions that are in the zoo are very aggressive)

or

The lions in the zoo are very aggressive. (The lions that are in the zoo are very aggressive)

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Similarly, should I say

Students in Accounting class are smart.

or

The students in Accounting class are smart.