Final answer:
Dolphins have the second largest brain in comparison to body size, after humans.
Step-by-step explanation:
The second largest brain in comparison to body size belongs to dolphins. Dolphins have large brains relative to their body size, with a brain to body ratio surpassed only by humans. Dolphins have the second largest brain in comparison to body size, after humans. The second largest brain in comparison to body size belongs to dolphins. Dolphins have large brains relative to their body size, with a brain to body ratio surpassed only by humans. Dolphins have the second largest brain in comparison to body size, after humans. The second largest brain in comparison to body size belongs to dolphins. Dolphins have large brains relative to their body size, with a brain to body ratio surpassed only by humans.