WildLife
Wildlife traditionally refers to any species of animal that is not domesticated to. Today, it has come to also include plants, fungi, and any other organism that grows in a wild area although humans have often domesticated wild plants. Plains, deserts, grasslands, forests, and rainforests, are all ecosystems that are habitats to the many species of wildlife around the world.
Amphibians, Reptiles, & Fish
Amphibians have a backbone and have gills for part of their lives. Frogs, toads and salamanders all fall under the category of amphibian. Reptiles are typically covered in scales and breathe with their lungs. Almost all reptiles are cold0blooded. Alligators, garter snakes, and sea turtles are examples of reptiles. Fish all live and breathe under water only. They breathe using their gills and absorb oxygen this way. Commonly known types of fish are catfish, salmon, sharks and trout. In the US alone there are more than 230 amphibians and over 280 reptiles and approximately 800 species of fish.
Birds
All Birds have feathers and can regulate their body temperature. Female birds lay eggs until they hatch. All birds have wings but not all birds can use them to fly, for example the chicken or the penguin. Penguins, live in cold climates and different in that the male looks after the egg and the hatched baby penguin while the mother hunts for food.
Invertebrates
Invertebrates are cold blooded animals. The latin word vertebra translates to a joint in general, or specifically from the spinal column. In turn the word invertebrates connects with these animals who have no spine. It is their most defining characteristic. Insects, butterflies, lobsters and crabs (crustaceans), worms, octopuses, starfish, and coral are all invertebrates.
Mammals
Mammals are warm blooded and females can produce milk in order to feed their babies. All mammals also have some form of hair. Humans DO fall under the category along with many other animals! Bears, monkeys, dolphins, dogs, elephants, lions, and deer are all examples of mammals. Scientists have identified over 5,400 mammal species on earth.
Plants
For the last one hundred years, or during the time of modern man, the extinction rate has been at an all-time high. There are several wildlife conservation groups continuously working to conserve natural habitats that are destroyed in order to create tourist areas, homes, and businesses in areas currently inhibited by wildlife. The global wildlife population has decreased by 52 percent between 1970 and 2014, according to a report by the World Wildlife Fund.
Information from NWF.Org and Wikepedia.