Name the type of evolution that has resulted in the development of structures like wings of butterfly and bird. What are such structures called ?

Explanation

**Step-by-Step Solution:**

1. **Identify the Structures**: The question refers to the wings of a butterfly and a bird. Both of these structures serve the function of flight.

2. **Classify the Type of Evolution**: The evolution that has led to the development of these wings is known as **convergent evolution**. This type of evolution occurs when different species independently evolve similar traits or functions as a result of adapting to similar environments or ecological niches.

3. **Define the Structures**: The wings of the butterfly and the bird are classified as **analogous structures**. These are organs that serve a similar function (in this case, flight) but have different evolutionary origins and structures.

...