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
The empire on which the sun never sets in all the Asian Subcontinents, and islands in the Atlantic, Indian and Pacific oceans. However, it was under his son Philip III of Spain that the Spanish Empire acquired its largest extension. Philip III and his son Philip IV of Spain were also kings of Portugal among other territories besides Spain, which made both of them the rulers of the greatest extension on earth of all time, simply by joining the global territories of Spain and Portugal empires account for more extension than any other king has ever ruled. In 1585, Giovanni Battista Guarini wrote "Il pastor fido" to mark