Sperm whale . Myoglobin, which stores oxygen in muscle tissue, is much more abundant than in terrestrial animals. The blood has a high density of red blood cells, which contain oxygen-carrying haemoglobin. The oxygenated blood can be directed towards only the brain and other essential organs when oxygen levels deplete. The spermaceti organ may also play a role by adjusting buoyancy (see below). The arterial retia mirabilia are extraordinarily well-developed. The complex arterial retia mirabilia of the sperm whale are more extensive and larger than those of any other cetacean. Atop the whale's skull is positioned a large complex of organs filled
Creature type (Dungeons & Dragons) by Positive energy (whereas Undead are animated or empowered by Negative energy). A dragon is a reptile-like creature, usually winged, and tends to have magical or unusual abilities. An elemental is composed of one or more of the four classical elementals of air, earth, fire, or water. Elementals almost always have the extraplanar subtype. Most natives of the elemental planes are elementals, however there are some exceptions, for example most types of genies are native to the elemental planes, however genies are outsiders. A fey is a creature which usually has supernatural abilities and a human-shaped form. A fey also