Why is birds the noun in sentence you like to look at birds?

You're absolutely right! "Birds" is the object of the preposition "at" in the sentence "You like to look at birds." Here's why:

* Prepositions show the relationship between a noun or pronoun and other words in a sentence. Common prepositions include "at," "on," "in," "to," "from," "by," etc.

* The object of a preposition is the noun or pronoun that follows the preposition. It's the thing that the preposition is "relating" to.

In the sentence "You like to look at birds," the preposition is "at," and the object of the preposition is "birds."

Let me know if you'd like to explore other examples or have more grammar questions!