Seal, Hawaiian Monk
Seal, Hawaiian monk
status: Endangered, IUCN Endangered, ESA
range: USA (Hawaii)
Description and biology
The Hawaiian monk seal is a large warm-water seal. It is a member of the family of true seals because it does not have external ear flaps as fur seals and sea lions do. An average Hawaiian monk seal measures 7 to 7.5 feet (2.1 to 2.3 meters) long and weighs 450 to 550 pounds (204 to 250 kilograms). Unlike in most other species, female Hawaiian monk seals are larger than their male counterparts. The color of a monk seal's body varies slightly, from slate gray on top to silver gray underneath.
Hawaiian monk seals eat a variety of aquatic animals, including fish, eels, and octopi. They feed mainly along the shorelines of the islands they inhabit. Sharks often prey upon the seals.
Male Hawaiian monk seals choose a mate by wandering the beaches where females sun themselves. Since there are three times as many males as females, the females are often
disturbed. When a male and female decide to mate, they do so in the water. After a gestation (pregnancy) period of about 330 days, a female Hawaiian monk seal gives birth on the beach to a single pup. She nurses the pup for five weeks, during which time she fasts (does not eat). At birth, the pups are weak swimmers, and they must practice under their mother's supervision until they are weaned.
Habitat and current distribution
The Hawaiian monk seal inhabits the islands and atolls (ring-shaped reefs surrounding lagoons) of the northwestern Hawaiian Islands. Breeding takes place primarily around Nihoa Island, Necker Island, French Frigate Shoals, Laysan Island, Lisianski Island, Pearl and Hermes Reef, the Midway Islands, and Kure Atoll. An estimated 1,200 Hawaiian monk seals remain in the wild.
Although some Hawaiian monk seals move between islands, most remain fairly close to their home beaches.
History and conservation measures
Hawaiian monk seals evolved in an environment totally free of humans. Since they did not know humans, they had no fear of them when contact was made. This made them easy prey for nineteenth-century hunters who sought their fur and blubber (fat that was melted down to make oil). Hunting was so rampant during this period, the species was pushed to the brink of extinction.
The population of Hawaiian monk seals increased slightly, however, in the early twentieth century as the animals sought out undisturbed, remote areas. During World War II (1939-45), humans began occupying more and more of the Hawaiian Islands, and the seals suffered. Any intrusion into their range has a negative effect on the seals. When disturbed by humans, a pregnant female may abort her fetus. If a nursing female is disturbed, she may be unable to continue nursing and her pup may die.
Increased fishing activity in the Hawaiian monk seal's range leads to conflicts between fishermen and seals. Many fishermen kill the seals, believing the animals steal their catch and damage their fishing nets. Some seals do become entangled in fishing nets and drown.
In 1940, a number of the islands and atolls in the Hawaiian monk seal's range were designated the Hawaiian Islands National Wildlife Refuge. In 1976, this area was further declared a Research Natural Area. These protective measures limit the number of human landings on the islands, insuring that Hawaiian monk seals—among the most endangered seals in the world—remain as undisturbed as possible.
"Seal, Hawaiian Monk." Endangered Species. . Encyclopedia.com. (January 24, 2019). https://www.encyclopedia.com/environment/applied-and-social-sciences-magazines/seal-hawaiian-monk
"Seal, Hawaiian Monk." Endangered Species. . Retrieved January 24, 2019 from Encyclopedia.com: https://www.encyclopedia.com/environment/applied-and-social-sciences-magazines/seal-hawaiian-monk
Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).
Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.
Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:
Modern Language Association
The Chicago Manual of Style
American Psychological Association
- Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
- In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.