What are patagia? Give their function.

Explanation

### Step-by-Step Solution:

1. **Definition of Patagia**: Patagia are specialized skin folds or extensions that are found in bats. Unlike the wings of birds, which are made of feathers and bone, bat wings are formed by a membrane of skin.

2. **Structure of Patagia**: In bats, the patagia connect the forelimbs (arms) to the hindlimbs (legs) and often extend to the body and tail. This creates a large surface area that is crucial for flight.

3. **Function of Patagia**: The primary function of patagia is to aid in flight. The skin membrane allows bats to glide and maneuver through the air efficiently. It acts like a parachute, providing lift and control during flight.

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