What is the difference between endangered and critically endangered species?

Explanation

**Step-by-Step Solution:**

1. **Definition of Endangered Species:**
- Endangered species are those whose population is significantly decreasing, putting them at a high risk of extinction. This decline is so severe that it is projected that they may not survive into future generations. Specifically, it is noted that about 80% of their total population has declined, leaving only 20% remaining.

2. **Examples of Endangered Species:**
- Examples of endangered species include the tiger and the giant panda. These species are in need of protection to prevent further decline.

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