Introduction to Zoology: What are Animals?

It's time to learn all about animals! And we aren't just talking about cats and dogs here, did you know that sea sponges and corals are also animals? It's a very diverse kingdom, that Animalia! It even includes us humans. So what defines an animal, and how do we categorize them? How many types of animals are there? Well in short, a lot, so strap in let's dig through the animal phyla one by one!