Just in time for the Craft Brewers Conference in Washington, D.C. at the end of March, Maryland’s Flying Dog and Evolution Craft Brewing are introducing a new collaboration beer, one that will evolve over the course of three iterations.

Natural Selection will first be released as a stock ale, one that carries caramel and dark fruit notes that mingle with hints of roast and chocolate. Genus One, as it will be known, will only be available in draft form at the CBC.

Then, the beer will branch off in two evolutionary ways. Genus Two will come from Flying Dog, as brewmaster Matt Brophy dry hops the stock into something new. Genus Three will be Evolution’s doing, after brewmaster Geoff DeBisschop barrel ages it for several months. Both of these versions of Natural Selection will be available in Mid-Atlantic markets come October.

More: Flying Dog and Evolution Brewery Announce Natural Selection Ale