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Researchers Have Determined That The India Jumping Ant Is The First Known Insect Capable of Shrinking (By 20%) And Increasing Its Brain Size. The Ants Are Said To Decrease Their Brain Size In A Bid To Become Queen, Conserving Their Brain Energy For Reproduction. They, However, Increase Their Brain Size To Normal If Their Bid Fails.

These Ants Shrink Their Brains for a Chance to Become Queen – The New York Times

https://www.nytimes.com/2021/04/13/science/ants-brains-queen.html

If their bids at motherhood fail, they can then regrow their brains.