Even among ants, royal status is mostly an inherited affair. But for Indian jumping ants, a shot at wearing the crown is worth losing a bit of your brain for — especially as you’ll always be able to grow it back later.

Unlike other ant species, Indian jumping ants (Harpegnathos saltator) do not die with their queens. Rather, select females participate in monthlong antenna-boxing matches to decide who gets to be the new matriarch. The victorious female then expands her ovaries and shrinks her brain to three-quarters of its original size.