The provided reference focuses on the physical characteristics of sperm whales, specifically their dark gray color, and mentions nothing about the color of their sperm. Therefore, based on the provided reference, we cannot determine the color of whale sperm.
It's important to note that the sperm whale's coloration is distinct from its reproductive fluid. While the sperm whale is dark gray, the color of its sperm is a separate characteristic. Information about the color of whale sperm must be found in a source that specifically addresses that topic, and was not available in the supplied document.
