Here's why:

* Animals are multicellular: Animals are complex organisms made up of many cells working together.

* Animals have eukaryotic cells: This is true. Eukaryotic cells have a nucleus and other membrane-bound organelles.

* Not all animals are eukaryotic: While most animals are eukaryotic, there are some exceptions. For example, there are single-celled organisms classified as animals called protozoans. These are eukaryotes but are not multicellular.

In summary:

* Animals are multicellular organisms.

* Animal cells are eukaryotic.

* There are single-celled animals (protozoans) that are also eukaryotes.