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There’s the narwhal, which mates “in a kind of ballet; a pair will swim alongside each other for hours, skins touching.”

In seven years on The Times’s National Desk, I wrote about everything from natural disasters to narwhals.

Menopause is known to exist in five species of toothed whale: short-finned pilot whales, false killer whales, killer whales, narwhals and beluga whales.

They found females of five "menopausal" species - narwhals and beluga, short-finned pilot, false killer and killer whales - lived about four decades longer than other toothed whales.

Five whale species — killer whales, false killer whales, beluga whales, short-finned pilot whales and narwhals — don’t fit that pattern.