Animals are divided into various sub-groups, some of which are:vertebrates (birds, mammals, amphibians, reptiles, fish), molluscs(clams, oysters, octopuses, squid, snails), arthropods (millipedes,centipedes, insects, spiders, scorpions, crabs, lobsters, shrimp),annelids (earthworms, leeches), sponges, and jellyfish

The word "animal" comes from the Latin word animalis, meaning"having breath"

In everyday non-scientific usage the word excludes humans – thatis, "animal" is often used to refer only to non-human members ofthe kingdom Animalia, often, only closer relatives of humans suchas mammals, or mammals and other vertebrates, are meant

The biological definition of the word refers to all members ofthe kingdom Animalia, encompassing creatures as diverse as sponges,jellyfish, insects, and humans