What are the 7 levels of classifications for endangered species?

Explanation

### Step-by-Step Solution

1. **Introduction to Classification**: The classification of endangered species is essential for understanding their conservation status. The International Union for Conservation of Nature (IUCN) has developed a system to categorize species based on their risk of extinction.

2. **The Red Data Book**: The IUCN maintains a document known as the Red Data Book or Red List, which lists species and their conservation status. This book includes seven categories that help in assessing the risk levels of various species.

3. **Least Concern**: The first category is "Least Concern." Species in this category have stable populations and are not at risk of extinction. They are abundant in their natural habitats.

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