Lime-Sized Brain, 300 Million Eggs: The Bizarre Survival of the Ocean Sunfish Meet the two-ton Ocean Sunfish (Mola mola), often called the dumbest fish alive. Despite its colossal size, its brain is famously no bigger than a lime, one of the lowest brain-to-body ratios of any vertebrate. It earns its reputation by clumsily flapping through the water and, tragically, by frequently mistaking floating plastic bags for its primary food, the jellyfish. This slow, oddly-shaped giant is also so riddled