Classify the following object according to the following categories:
Object: Bird
Categories: Mammal, Insect, Fish, Bird
The object "Bird" is classified under the category "Bird."
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify the following object according to the following categories:

### Input:
Object: Bird
Categories: Mammal, Insect, Fish, Bird

### Output:
The object "Bird" is classified under the category "Bird."