"Behold the Squid!" That is not said nearly enough. Williams delves into the world and science of squid including much of the research we are doing concerning them. She also includes many interesting insights into the life of these fascinating animals.
Interesting tidbit: Neurosurgeons and scientist frequently learn how to extract neurons from common squid because they have a comparatively large neuron that is easy to extract (and the squid and common enough to make good test subjects).
Another interesting tidbit: The colossal squid has bioluminescent patches behind its eyes that shine light out, like headlights in the cold ocean deep.