Find the odd animal (bird vs mammal): Pick the one that is not a bird.

Introduction / Context:
Taxonomic classification offers a crisp dividing line. Three options are birds (class Aves) with feathers and beaks. A bat is a mammal (class Mammalia) with fur and mammary glands.

Given Data / Assumptions:

• Parrot, Crow, Pigeon: birds.
• Bat: mammal that can fly (powered flight).

Concept / Approach:
Use class-level taxonomy. Despite superficial similarity (wings, flight), bats are not birds; they are mammals with distinct anatomy and reproduction (live young, nursing).

Step-by-Step Solution:

Verification / Alternative check:
Feathers vs fur: birds have feathers; mammals have hair/fur. Bats lack feathers.

Why Other Options Are Wrong:
They share the core bird traits.

Common Pitfalls:
Do not classify by ability to fly alone; some birds cannot fly and some mammals can (bats).

Final Answer:
Bat