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Parrin's Harvester docked atop Galactica's starboard flight pod (Battlestar Galactica Classic #1).

The Harvester is the primary class of spacecraft built by the Okaati during the seventh-millennium. Harvesters of varying size are constructed to house the remnants of the Okaati civilization during their millennia-long exile within their own fugitive fleet. While christened as a nod to their agricultural roots, Harvesters serve as manufacturing, resource processing, and housing crafts for the Okaati people.

An exemplification of Okaati engineering acumen, Harvester crafts feature the ability to carry any cargo and convert it over to whatever they need, including the creation of new Harvesters. New Harvesters are built in space as their fleet travels the Empyrean Expanse (Battlestar Galactica Classic #1).

Harvesters are built for both hauling and speed, given the Okaati's parasitical nature and their need to avoid the Comitat's pursuit crafts. While armed with fixed forward-facing weapons, Harvesters use their adroit nature to avoid combat, and are able to both board via airlocks capable of connecting a wide variety of different space crafts and installations, as well as towing ships of great bulk at rapid speed via magnetic grapnels in concert with superior engine systems (Battlestar Galactica Classic #1-#5).

Parrin illustrates how the Harvesters are central to their very existence, and their ability to make use of materials to build new ships for their fleet (Battlestar Galactica Classic #1).