Do you’ve any idea about how many animal species are there on Earth? There are as many as 30 million animal species alive. It always excites an individual to learn more about these species, but it is quite a challenging task too. As there is enormous number of species, it becomes difficult to remember each one of them. So, to possess a clearer idea, you could segregate these species of animals into 6 fundamental groups.
The first group of animals is invertebrates. As the name suggests, these animals lack a spine or vertebral column. Those of you suffering from back pain might be wishing that you were an invertebrate too. Some species that drop into this category encompass 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 could be broadly classed into cartilaginous fish, ray finned fish and lobe finned fish. Amidst the three, it’s ray finned fish that is 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 species of amphibians. Some animals that fall in this category include frogs, salamanders and the like.
One of the most crucial categories of species of animals is Reptiles. These cold blooded vertebrates exhibit two varying characteristics. One of their traits is that they have scales all over their body and the other is that they produce hard eggs. First amphibian came into existence 340 million years ago. Some of the popular amphibians are crocodiles, tuataras, squamates, turtles, etc.
Mammals is perhaps the most evolved category of animals. They inhibit a diverse selection of characteristics and may adjust themselves to a diverse range of habitats. There are at least 5,400 species of animals alive today. Mammals are extremely diverse. They range from the tiny Bumblebee Bat, that is three centimeters to the blue whale, which is 33 cm in length. Did you know that humans are also mammals?
When talking in regards to the fundamental categories of animals, there’s no way that you could miss out on birds. For many birds are wildlife that could fly. However, they have several other features as well that differentiate them from the remaining. These involve feathers, bills and a furcula. It’s a dazzling feel to see birds fly. No surprise, many people take bird watching as their hobby. You too could make bird watching as your hobby given that you’re not worries about a sun tan.
Knowing more about diverse categories of animas is enriching indeed.
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