Here's why:
* They are multicellular organisms: They are made up of many cells organized into tissues and organs.
* They are eukaryotic: Their cells have a nucleus and other membrane-bound organelles.
* They are heterotrophic: They obtain their nutrition by consuming other organisms (plants, fungi, insects).
* They are capable of movement: They can move around their environment using their legs.
* They can reproduce sexually: They reproduce by mating and laying eggs.
In summary, gopher tortoises exhibit all the characteristics that define animals, making them undeniably part of the animal kingdom.