Now here's a story for your Friday!
Great white sharks travel huge distances and mysteriously spend up to six months gathered at an isolated spot in the Pacific Ocean between California and Hawaii.
Satellite tagging has revealed that male and female sharks make frequent and repetitive dives together, which may be linked to courtship.
The stretch of ocean the sharks make for - from both California and Mexico - is not a particularly rich feeding ground but it may act as a "singles bar" where they can find a mate.
"There is something going on there but as yet we don't know," said marine biologist Professor Ron O'Dor. "Maybe it's just a good place to pick up girl sharks."
The shark mystery is one of thousands to emerge from an ambitious attempt to compile the first comprehensive survey of life in the world's oceans.
The Census of Marine Life is a 10-year project which will summarise everything known about all forms of life in the sea.
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