Satellite tagging discovers that white sharks travel long distances each winter to concentrate in the Pacific for up to six months. While there, both males and females make frequent, repetitive dives to depths of 975 feet (300 meters), which researchers theorize may be significant in either feeding or reproduction.
So sharks do something extraordinary for sex or food. Wonder how the researchers figured that out?

One would think that somehow my tax dollars were involved in this oh, so fascinating — and very imformative and probably brand new — research.
(Yeah, I was rolling my eyes.)
Do they beep their horns when female sharks walk by? (“These are the best ideas we [men] have.” – Jerry Sienfeld)
[...] Because they can; sex and food, and apparently the little sociopaths enjoy [...]