When things get tough in adulthood, it might seem appealing to return to simpler times.
One bizarre marine creature has taken this approach to dire situations quite literally, regressing its physical adult body to a juvenile stage once the stress of starvation or injury has subsided.
Until now, the immortal jellyfish (Turritopsis dohrnii) was the only species thought to be able to wind back the clock on jelly-puberty like this, but now it’s joined by Mnemiopsis leidyi, better known as the sea walnut or the warty comb jelly.
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