Write the names of any two respiratory pigments found in animals.

Explanation

**Step-by-Step Solution:**

1. **Understanding Respiratory Pigments**: Respiratory pigments are specialized proteins found in the blood of animals that facilitate the transport of oxygen. They play a crucial role in increasing the oxygen-carrying capacity of the blood.

2. **Identifying Examples**: There are several types of respiratory pigments found in different animal groups. Two prominent examples are:
- **Hemoglobin**: This is the most well-known respiratory pigment, primarily found in humans and other higher vertebrates. It binds to oxygen in the lungs and releases it in tissues.
- **Hemocyanin**: This pigment is found in some invertebrates, including arthropods (like crabs and spiders) and mollusks (like octopuses and snails). Hemocyanin contains copper and gives the blood a blue color when oxygenated.

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