Recently learned it's actually "Eagles", not "The Eagles". (For example, take a look at the album covers. There are also documentaries in which they talk about it.)
But even the band themselves will use "the" when it grammatically makes sense. So confusing.
https://blogs.iu.edu/sciu/2023/05/06/the-longest-sperm-on-earth/
Apparently the female seminal receptacle is also very long. In fact, the increasing length of this receptacle is one of the explanations for the extreme sperm length.