What is the most outstanding feature of lion-tailed macaque ?

Explanation

### Step-by-Step Solution

1. **Identify the Animal**: The lion-tailed macaque is a type of langur, which is a primate species.

2. **Outstanding Feature - Tail**: The most outstanding feature of the lion-tailed macaque is its unique tail. The tail is black and has a tufted shape, resembling that of a lion, which is how it gets its name.

3. **Social Behavior**: Lion-tailed macaques are known for their social behavior. They prefer to avoid human interaction and typically travel in groups of around 20 individuals.

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