Here's the breakdown:
* Species: The most basic unit of classification. A group of organisms that can interbreed and produce fertile offspring. Examples: *Homo sapiens* (humans), *Canis lupus* (wolves), *Panthera leo* (lions).
* Genus: A group of closely related species. Examples: *Homo* (includes humans and extinct human relatives), *Canis* (includes wolves, dogs, coyotes, etc.), *Panthera* (includes lions, tigers, leopards, etc.).
* Family: A group of closely related genera. Examples: Hominidae (great apes), Canidae (dogs, wolves, foxes, etc.), Felidae (cats).
* Order: A group of closely related families. Examples: Primates (monkeys, apes, humans), Carnivora (meat-eating mammals), Artiodactyla (even-toed ungulates).
* Class: A group of closely related orders. Examples: Mammalia (mammals), Aves (birds), Reptilia (reptiles).
* Phylum: A group of closely related classes. Examples: Chordata (animals with a backbone), Arthropoda (insects, spiders, crustaceans).
* Kingdom: The highest level of classification. Examples: Animalia (animals), Plantae (plants), Fungi (fungi).
So, "mammal" is a class that includes a wide variety of species, such as humans, dogs, whales, bats, and many more.