Define birds, Give three examples each of flightless birds and insectivorous birds

Answer

### Step-by-Step Text Solution:

1. **Definition of Birds**:
Birds are warm-blooded vertebrates that belong to the class Aves. They are characterized by the presence of feathers, a beak without teeth, and a high metabolic rate. Birds are bipedal, meaning they have two legs, and they are air-breathing animals. Most birds are capable of flight, although some species have lost this ability.

2. **Examples of Flightless Birds**:
Flightless birds are species that have lost the ability to fly through evolution. Here are three examples:
- **Ostrich**: The largest living bird, native to Africa, known for its long legs and fast running speed.
- **Kiwi**: A small, flightless bird native to New Zealand, recognized for its long beak and brown, fuzzy feathers.
- **Penguin**: A group of aquatic, flightless birds primarily found in the Southern Hemisphere, especially in Antarctica. They are known for their distinctive black and white plumage and swimming abilities.

3. **Examples of Insectivorous Birds**:
Insectivorous birds are those that primarily feed on insects. Here are three examples:
- **Swallow**: Known for their aerial feeding habits, swallows catch insects in flight.
- **Nightingale**: A small bird famous for its powerful and beautiful song, it primarily feeds on insects and larvae.
- **Warbler**: A small songbird that often forages for insects among leaves and branches.