With its interesting movements and sometimes bizarre appearance, the cuttlefish is one of the most fascinating creatures in the sea. This recent documentary from NOVA explores the world of the cuttlefish and its behaviors. On the homepage, visitors can watch the 53-minute film in its entirety. There are many extra features on the site, including a teacher's guide, a transcript, and a set of external links and related readings. There are four additional sections, including "Anatomy of a Cuttlefish" and "Mating Trickery". In the "Mating Trickery" section, visitors can view a slide show of how cuttlefish mate, along with comparisons from the rest of the animal world, including fish and reptiles. Additionally, the "Anatomy of a Cuttlefish" area explores some of the animal's more unusual features, such as its blue-green blood and its three hearts.