Classification – Among the following, identify the odd one out by considering biological class. Three are birds, while one is a mammal. Which option does not belong? Options: Parrot, Bat, Crow, Sparrow.

Introduction / Context:
Odd-one-out problems often exploit taxonomic distinctions. Here, three items are avian (birds), while one belongs to the class Mammalia. Recognizing high-level biological categories provides a quick and reliable rule for exclusion.

Given Data / Assumptions:

• Parrot: bird.
• Crow: bird.
• Sparrow: bird.
• Bat: mammal, although capable of powered flight.

Concept / Approach:
The task is to identify which entity violates the majority taxonomic class. Even if two categories can share a surface trait (e.g., flight), the underlying classification (bird vs mammal) prevails.

Step-by-Step Solution:
Step 1: Label each option as bird or mammal.Step 2: Note that Parrot, Crow, and Sparrow are birds.Step 3: Note that Bat is a mammal; hence, it is the odd one out.

Verification / Alternative check:
Consider anatomical traits: birds have feathers and beaks; bats have fur, mammalian dentition, and nurse their young—confirming mammalian status.

Why Other Options Are Wrong:
Parrot/Crow/Sparrow: All are avian and thus fit the majority category.

Common Pitfalls:
Do not rely solely on the presence of flight; taxonomic class is the deciding factor.

Final Answer:
Bat