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We present the remarkable discovery that the dwarf irregular galaxy NGC 2366is an excellent analog of the Green Pea (GP) galaxies, which are characterizedby extremely high ionization parameters. The similarities are drivenpredominantly by the giant H II region Markarian 71 (Mrk 71). We compare thesystem with GPs in terms of morphology, excitation properties, specificstar-formation rate, kinematics, absorption of low-ionization species,reddening, and chemical abundance, and find consistencies throughout. Sinceextreme GPs are associated with both candidate and confirmed Lyman continuum(LyC) emitters, Mrk 71/NGC 2366 is thus also a good candidate for LyC escape.The spatially resolved data for this object show a superbubble blowoutgenerated by mechanical feedback from one of its two super star clusters(SSCs), Knot B, while the extreme ionization properties are driven by the <1Myr-old, enshrouded SSC Knot A, which has ~ 10 times higher ionizingluminosity. Very massive stars (> 100 Msun) may be present in this remarkableobject. Ionization-parameter mapping indicates the blowout region is opticallythin in the LyC, and the general properties also suggest LyC escape in the lineof sight. Mrk 71/NGC 2366 does differ from GPs in that it is 1 - 2 orders ofmagnitude less luminous. The presence of this faint GP analog and candidate LyCemitter (LCE) so close to us suggests that LCEs may be numerous andcommonplace, and therefore could significantly contribute to the cosmicionizing budget. Mrk 71/NGC 2366 offers an unprecedentedly detailed look at theviscera of a candidate LCE, and could clarify the mechanisms of LyC escape.

Mrk 71/NGC 2366: The nearest Green Pea analog