Introduction to animals and their Species characteristics


 Introduction to animals and their Species

What is an animal? Everyone is known to the answer more or less. Animals are the members of Animalia kingdom and they are multicellular. They also called Metazoa. Normally animals take food and digest it internally. It is estimated that there are around 9 or 10 million animals are live in the Earth.Introduction animals Species

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It can be more but its exact amount is not known to anybody. Each individual species within the genus is named after its individual features and characteristics. The names of animals are in Latin so that they can be understood worldwide, and consist of two words. The first word in the name of an animal will be the genus, and the second name indicates the specific. The non-moving animals are called sessile and the animals that can move are called motile. The animals that are moved a little are known as sedentary.  They get the energy for movement from muscular tissue.Introduction animals Species sessile 






Some animals are producing both eggs and sperm and some are capable of sexual reproduction. Some are exchange sperm during mating.

Beetles are exchange sperm during mating

Some Female animals produce eggs and the eggs develop without being fertilized. It called parthenogenesis and it occurs in several kinds of fishes, insects, a few species of frogs and lizard.

Komodo dragon’s Parthenogenesis

Levels of Organism:

 All animals organism can be classified at 7 different levels and they are

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  • Kingdom- Animalia : fish, snake, dog, panda, pig, insects, grizzly bear
  • Phylum- chordate : black bear, snake, bird, pig, dog, fish
  • Class – Mammalia : grizzly bear, black bear, panda, pig, dog
  • Order – carnivore : dog, panda, black bear, grizzly bear
  • Family – Ursidae : panda, black bear, grizzly bear
  • Genus – ursus : black bear, grizzly bear,Introduction animals Species
  • Species – horribilis : grizzly bear,Introduction animals Species
  • Individual cells work together for the good of the entire organism. The cells become dependent on one another.

Multicellular organisms have the following 5 levels of organization ranging from simplest to most complex:

  • Cells – Tissue – Organ – Organ Systems- Organism
    • Cells make up tissues and life begins from cells. For examples –blood cells, bone cells, nerve cells etc
    • Tissues make up organs. Examples – blood, nervous, bone etc.
    • Organs make up organ systems. Examples: heart, brain, skin etc
    • Organ systems make up an Organism. Examples – circulatory system, nervous system, skeletal system, etc.
    • Organism is Entire living things that can carry out all basic life processes.They can take in materials, release energy from food, release wastes, grow, respond to the environment, and reprodIntroduction animal Speciesuce. Examples – bacteria, amoeba, mushroom, sunflower, human

Levels of organization

Characteristics of animals:

Though animals are divided into 40 smallest groups, there are 5 characteristics of it. They are invertebrates, vertebrates, Arthropoda, Mollusca and Echinoderms.

  • Invertebrates are known as cnidaria and they have no backbone. Generally they are cold blooded and they can not regulate their own body temperature. They are the simplest animal in all the animals’ kingdom. For examples sponges, cnidarians, jurgen etc

Invertebrates group

  • Vertebrates are known as chordate and they have backbone and skeleton. Vertebrate’s animals include human. Backbone helps to protect their spinal cord and have a skull that protects their brain. They have a lot of bones. Dogs, horses, lizards, dogs, cats, and many other animals are in the vertebrate category.

Vertebrates group

  • In the world more than 80% of all the animals are arthropods They have six or more legs which are joined and most of them have two compound eyes.The word arthropod comes from the Greek words means having six or more ‘joint’ or ‘foot’

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Arthropods animal

  • Mollusca are the members of Animalia kingdom and have a soft body and a head and a foot region. They are the source of foods, jewelry and pets for humans. There are more than 1000,000 living species molluscas are alive on the earth. They are the second largest animals group on the earth. Molluscas have three basic parts: foot, a visceral mass and a mantle. The mantle is the layer of tissues.Introduction animals Species

Mollusca group animals

  • Echinodermata contains about 6000 species and their name comes from Greek words by that they are known all over the world in one name. Echinodermata means spiny skin. But all the members of this group do not have spiny skin. Sea stars, sand dollars, sea cucumber, sea lilies and the sea urchins are the well known members of the group. Echinodermata are the marine animals and they are vertebrates.Introduction animals Species
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