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Star-forming dwarfs were the dominant galaxy types at the high-redshift universe. ..Green Pea. openParGPclosePar galaxies at redshift zvirgul0.2-0.3 have been established to be their best nearby analogs comma reinforced by a recent detection of the escape of ultraviolet radiation that ionizes the surrounding intergalactic medium. We have detected GP X-ray emission higher than any theoretical or empirical prediction. To understand its uniqueness comma we propose XMM-Newton observation of a sample of 8 local dwarf galaxies at z<0.1 openParcalled BlueberriesclosePar selected by criteria analogous to the GPs. If a similar X-ray excess is found comma then Blueberries will represent convenient local laboratories for studying the processes of X-ray binary formation and feedback in extreme conditions.