Do you capitalize the name of a robin or deer in sentence?

You do not capitalize the names of specific animals like "robin" or "deer" unless they are part of a proper noun (like a name).

Examples:

* Correct: I saw a robin in my backyard.

* Correct: The deer ran across the road.

* Correct: My pet robin is named Tweety. (Tweety is a proper noun)

* Correct: The deer named Bambi was a popular cartoon character. (Bambi is a proper noun)

Hope this helps!