"Aaron Baugher" wrote in message

"Roger Zoul" wrote:

Don't the sperms from the same male compete, each tying to be the
"seed"?

"Cubit" writes:
In same males it seems to be a horse race. With different males there is
actual combat between sperm, if I remember the PBS special correctly.

That's my understanding too, although from other sources than PBS: that
something like 90% of sperm aren't designed to fertilize eggs, but are
built for combat with foreign sperm. I don't know if it's the case with
all animals, or just humans. I just picked up the book "Sperm Wars,"
which I think gets into this in detail, but it's still in my to-read
pile.

Interesting stuff. Thanks.