Do you've any idea about how many animal species are present on Earth? There're as many as 30 million animal species alive. It always excites an individual to understand more about these species, but it is quite a challenging task too. As there's giant number of species, it becomes tough to remember each one of them. So, to have a clearer idea, you can segregate these species of animals into 6 standard categories.
The 1st class of animals is invertebrates. As the name suggests, these animals lack a spine or vertebral column. Those of you struggling with back pain may be wishing that you were an invertebrate too. A few species that drop into this category involve flatworms, insects, microorganisms and the like. 97% of the animals alive today are invertebrates.
Fishes is another animal group. They were the 1st vertebrates to evolve. Fishes can be broadly classified into cartilaginous fish, ray finned fish and lobe finned fish. Amidst the three, it's ray finned fish that's the most versatile and has 24,000 species. If you want an additional pet along with your pet dog, then fishes are a brilliant option.
Another broad category of animal is amphibians. These are the animals that live both- on land and water. The first amphibians developed from lobe finned fishes, approximately 370 million years ago. Approximately, there are 5000 to 7000 types of amphibians. Some animals that fall in this category include frogs, salamanders and the like.
Reptiles, is another significant category of animals. By essence, they are cold blooded vertebrates. There're two unique features of reptiles. First of all, they have scales on their body and secondly they lay hard eggs. The 1st amphibians date back to 340 million years ago. Crocodiles, turtles, tuataras and squamates are a few examples of reptiles.
Mammals is maybe the most evolved category of animals. They inhibit a diverse range of characteristics and could adjust themselves to a large variety of habitats. There are at least 5,400 types of animals alive today. Mammals are extremely diverse. They range from the tiny Bumblebee Bat, which is three centimeters to the blue whale, which is 33 cm in length. Did you know that humans are additionally mammals?
When speaking concerning the principle categories of wildlife, there is no manner that you could miss out on birds. For many birds are wildlife that may fly. Nevertheless, they have a number of other features as well that set apart them from the rest. These involve feathers, bills plus a furcula. It is a dazzling feel to observe birds fly. No wonder, a lot of people take bird watching as their hobby. You too could make bird watching as your hobby given that you are not worries about a sun tan.
Gaining knowledge about species of animals is an enriching experience for sure.
Here is some more information on Suffering From Back Pain and Sun Tan.
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Animal mating ritual of the exotic greater bird of paradise - David Attenborough - BBC wildlife
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