What is an Animalia Kingdom?

In Biology, scientists use a classification system to separate the various different species of animals into groups. This process, called taxonomy, has a specific order, which is as follows: Kingdom, Phylum, Class, Order, Family, Genus, and Species.

To answer your question, standard US scientific textbooks state that there are six different Kingdoms. The six Kingdoms are Animalia, Plantae, Fungi, Protista, Moneran, and Bacteria.

With regard to an organism being classified into the kingdoms, the organism must be "multi-cellular", meaning it must be made of many cells.

Secondly, the organism must be a heterotroph, which means it must eat other organisms to survive.

Next, for an organism to be classified as an animal, it must be able to be aware of its environment and react to it.

Additionally, an animal requires oxygen for its metabolism to run. Finally, an organism that is classified as an animal must be able to reproduce sexually or asexually.

The Yeti Crab's method of survival at depths below 7000 feet are not as yet understood.