Vampire bats are

Options

A. Large sized
B. Small sized
C. Sanguivorous
D. Both B and C .

Answer

**Step-by-Step Solution:**

1. **Identify the Options:** The question provides four options regarding vampire bats:
- A) Large size
- B) Small size
- C) Sanguivorous
- D) Both B and C

2. **Scientific Name and Habitat:** The scientific name of vampire bats is *Desmodus rotundus*. They are primarily found in Central and South America.

3. **Size of Vampire Bats:** Vampire bats are characterized as small-sized bats. Therefore, option A (large size) is incorrect.

4. **Dietary Habits:** Vampire bats are known for their unique feeding behavior. They are sanguivorous, meaning they feed on blood. This makes option C correct.

5. **Combining Options:** Since option B (small size) and option C (sanguivorous) are both correct, option D (both B and C) is also correct.

6. **Conclusion:** The correct answer to the question "Vampire bats are" is option D (both B and C).

**Final Answer:** Vampire bats are both small-sized and sanguivorous (Option D).

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