Classification of Animal

Animals can be classified in different ways based on their body structure and how they reproduce.

1. Unicellular and Multicellular Animals

• Unicellular animals consist of just one cell. Paramecium and amoeba are examples of unicellular animals.
• Multicellular animals are made up of many cells. Examples include horses, bears, and tortoises.

2. Vertebrates and Invertebrates

• Vertebrates are animals that have a vertebral column (backbone). The vertebral column is a long, bony structure that supports the body. Examples of vertebrates are snakes, birds, fish, kangaroos, and humans.
• Invertebrates are animals that do not have a vertebral column (backbone). Examples of invertebrates are snails, cockroaches, and earthworms.

Animals rely on others for food because they cannot make their own food like plants. They are usually found in places where food is available. Different animals eat in different ways. For example:

• Herbivores like cows and sheep eat plants.
• Carnivores like lions and tigers eat other animals.
• Omnivores like humans and bears eat both plants and animals.

The way animals get their food affects their body structure. For example, lions have sharp teeth to tear meat, while cows have flat teeth for grinding plants.

Methods of Obtaining Food: Different animals have special ways of getting their food.

• Birds have beaks to pick or tear food.
• Fish have gills to filter food from water.
• Insects like butterflies have a tube-like mouth to suck nectar from flowers.

These different methods of eating also lead to differences in their body structure.

Reproduction is the process by which living things produce offspring or young ones similar to themselves. It is an important characteristic of all living things. There are two main types of reproduction in animals:

1. Oviparous Animals: Oviparous animals lay eggs. For example, a hen lays eggs, and after a few days, the young chicks hatch out of the eggs. Other examples of oviparous animals include birds, reptiles, and fish.
2. Viviparous Animals: Viviparous animals give birth to live young ones. For example, a cow gives birth to a calf. Before the calf is born, it grows inside the cow's body. Other examples of viviparous animals include humans, dogs, and cats.

1. Terrestrial animals: Terrestrial animals live on land and are adapted to survive in land environments. Examples include lions, elephants, dogs, and cows.
2. Aquatic animals: Aquatic animals are those that live in water. Examples include fish, dolphins, and whales. These animals live in rivers, lakes, oceans, or ponds and are adapted to survive underwater.
3. Amphibious animals: Some animals can live both on land and in water. These animals are called amphibians. Examples include frogs, salamanders, and toads. Amphibious animals spend part of their lives in water (usually during the early stages) and part of their lives on land.
4. Aerial Animals: Aerial animals fly in the air but live in various habitats. Examples include kites, eagles, crows, butterflies, and honeybees. Even though they can fly, they may live in different environments like forests, fields, or near human settlements.