What is the complete subject of sentence another animal with a strange name platypus?

The complete subject of the sentence "Another animal with a strange name is the platypus" is another animal with a strange name.

Here's why:

* Subject: The subject of a sentence is the person, place, thing, or idea that the sentence is about.

* Complete Subject: The complete subject includes the simple subject and any modifiers that describe it.

In this case, the simple subject is "animal" and the modifiers are "another" and "with a strange name".