Write the negation of each of the following statements.
All pets are mammals.

Answer

To find the negation of the statement "All pets are mammals," we need to understand what negation means in logical terms. The negation of a statement is essentially the opposite of that statement.

### Step-by-Step Solution:

1. **Identify the Original Statement**:
The original statement is "All pets are mammals."

2. **Understand the Meaning of Negation**:
The negation of a statement means that the statement is not true. If the original statement claims that all members of a certain group have a particular property, the negation would assert that at least one member of that group does not have that property.

3. **Formulate the Negation**:
The statement "All pets are mammals" can be negated by stating that "Not all pets are mammals." This implies that there exists at least one pet that is not a mammal.

4. **Final Negation Statement**:
Therefore, the negation of the statement "All pets are mammals" is "At least one pet is not a mammal."

### Final Answer:
The negation of the statement "All pets are mammals" is "At least one pet is not a mammal."

---