Question

Black Robin of Chantham Island is one of the rarest birds in the world . Change its degree

Answer 1

There are three kinds of Degree. They are:
1) Positive Degree
2). Comparative Degree
3). Superlative Degree

The Given sentence is,

Black Robin of Chantham Island is one of the rarest birds in the world.

It is in Superlative Degree.

Comparative Degree:

Black Robin of Chantham Island is raree than most other birds in the world.

Positive Degree:

Very few birds in the world are as rare as Black Robin of Chantham Island.

Have a nice day, Bro