Baleen

Baleen is a filter-feeder system inside the mouths of baleen whales. The baleen system works when a whale opens its mouth underwater and the whale takes in water. The whale then pushes the water out, and animals such as krill are filtered by the baleen and remain as food source for the whale. Baleen is similar to bristles and is made of keratin, the same substance found in human fingernails and hair. Some whales, such as the bowhead whale, have longer baleen than others. Other whales, such as the gray whale, only use one side of their baleen. These baleen bristles are arranged in plates across the upper jaw of the whale. Baleen is often called whalebone, but that name also can refer to the normal bones of whales, which have often been used as a material, especially as a cheaper substitute for ivory in carving.

Depending on the species, a baleen plate can be 0.5 to 3.5 metres (1.6 to 11.5 ft) long, and weigh up to 90 kilograms (200 lb). Its hairy fringes are called baleen hair or whalebone-hair. They are also called baleen bristles, which in sei whales are highly calcified, calcification functioning to increase their stiffness. Baleen plates are broader at the gumline (base). The plates have been compared to sieves or Venetian blinds.

Whalebone (horse)

Whalebone (1807 – 6 February 1831) was a British Thoroughbred racehorse that won the 1810 Epsom Derby and was a successful sire of racehorses and broodmares in the 1820s. Whalebone and his full-brother Whisker were produced by the prolific and important broodmare Penelope, and they contributed to the perpetuation of the genetic line (tail-male) of their sire Waxy and grandsire Eclipse into the 20th century. Whalebone raced until he was six years old and was retired to stud at Petworth in 1815. Whalebone sired the Derby winners Lap-dog, Spaniel and may have been the sire of Moses. Other notable sons are Sir Hercules and Camel, the sire of Touchstone. Whalebone died in 1831 at the age of 24 of hemorrhage after covering a mare.

Background

Whalebone was bred by the Duke of Grafton in 1807 at his Euston Hall stud farm near Newmarket. He was sired by the 1793 Epsom Derby winner Waxy out of the mare Penelope (foaled in 1798), both owned by the Duke. As a racehorse, Penelope was a contemporary of the 1801 Derby-winning filly Eleanor, beating her several times, and was half-sister to 1809 Derby winner Pope and the mares Pope Joan (both sired by Waxy), Parasol (Partisan's dam) and Prudence. Penelope was a prolific and influential broodmare, producing eight full-siblings to Whalebone that achieved success on the turf. She produced 13 foals between 1806 and 1823, all with names beginning with the letter W. Whalebone was her second foal and his full-siblings include Web, Woful, Wilful, Wire, Whisker, Wildfire and Windfall. Penelope died in 1824.