1. The problem asks to find what percent of the animals listed are mammals. 2. The formula to find percentage is: $$\text{Percentage} = \left(\frac{\text{Part}}{\text{Whole}}\right) \times 100$$ where "Part" is the number of mammals and "Whole" is the total number of animals. 3. Calculate the total number of animals: $$32 + 16 + 8 + 8 + 12 + 4 = 80$$ 4. Substitute the values into the formula: $$\text{Percentage of mammals} = \left(\frac{32}{80}\right) \times 100$$ 5. Simplify the fraction by canceling common factors: $$\left(\frac{\cancel{32}}{\cancel{80}}\right) = \frac{2}{5}$$ 6. Now calculate the percentage: $$\frac{2}{5} \times 100 = 40$$ 7. Therefore, 40% of the animals on the list are mammals.