_______are vestigial organs in ostrich.

Explanation

**Step-by-Step Solution:**

1. **Understanding Vestigial Organs:**
- Vestigial organs are body parts that have lost their original function through the course of evolution. They are remnants of organs that were functional in ancestral species but have become useless in the current species.

2. **Identifying Vestigial Organs in Ostrich:**
- The ostrich is a flightless bird, which means it has lost the ability to fly. Despite this, it possesses wings.

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