I do believe Willy was a Killer Whale, not as big as a Sperm Whale but quite substantial none the less. Much bigger than the ones In A Pickle showed you.
sperm are indeed living creatures, thousands and thousands of them in each ejaculation. but only one lucky one infiltrates the egg. the rest apparently die off. i feel sorry sometimes for the millions that i have just let loose on the carpet or down the toilet, for all i know they could still be searching for the egg. how cruel is that?