Undeniably eligible for the 2019picoftheweek title: In Your Hand
[For details of #2019picoftheweek challenge see MariaAntonia]
The gall-fly, in need of sustenance for her developing larvae, genetically modifies the oak to produce for her infants this cosy home. I know some of my readers will high-five the air when I say reproduction for the gall-fly (aka gall wasp) is usually parthenogenetic … i.e. no male required.