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These vast organisms “swim” gracefully through the upper layers of their gas giant’s atmosphere, feeding on particulate matter and absorbing solar radiation. Because of their large size and passive behavior, they are often referred to colloquially as “moon whales”.Balaena lack a central nervous system and possess only the relative intelligence of an Earth sponge. Because there is no solid material in their gaseous habitat to navigate around, Balaena never developed the complex intelligence necessary to interact with their environment. They are able to alter their buoyancy with a complex gas bladder, and rise to the higher levels of their atmosphere during their planet’s several week long day before retreating to the deeper levels for the long night. These creatures can live for thousands of Sol years, but eventually age and sink into the deeper layers of their planet where they are crushed by increasing atmospheric pressures.