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how long is a hammerhead shark

No human fatalities have been recorded.[27]. According to DNA studies, the ancestor of the hammerheads probably lived in the Miocene epoch about 20 million years ago. how to catch Hammerhead Shark When hooked, hammerheads fight hard making long surface and midwater runs while thrashing about causing a great deal of commotion. The coloration of the Great Hammerhead can range from gray-brown to green on their dorsal sides, and off-white on their ventral sides, and their teeth are extremely jagged and triangular. The Great Hammerhead shark is the largest of all the species of hammerhead sharks. hammerhead dorsal fins. The great and the scalloped hammerheads are listed on the World Conservation Union's (IUCN) 2008 Red List as endangered, whereas the smalleye hammerhead is listed as vulnerable. ", "Husbandry of scalloped hammerhead sharks Sphyrna lewini (Griffith & Smith, 1834) at Reef HQ Aquarium, Townsville, Australia", "Indigenous knowledge and cultural values of hammerhead sharks in Northern Australia", "Electroreception in juvenile scalloped hammerhead and sandbar sharks", https://en.wikipedia.org/w/index.php?title=Hammerhead_shark&oldid=993465792, Wikipedia pending changes protected pages, Short description is different from Wikidata, Articles with unsourced statements from May 2019, Creative Commons Attribution-ShareAlike License. [13], Reproduction occurs only once a year for hammerhead sharks, and usually occurs with the male shark biting the female shark violently until she agrees to mate with him. [40][41], "Record Hammerhead Pregnant With 55 Pups", "Marine Species ID: Great Hammerhead vs. Scalloped and Smooth Hammerhead", "Hammerhead shark study shows cascade of evolution affected size, head shape", "Enhanced visual fields in hammerhead sharks", "This Shark Eats Grass, and No One Knows Why", "IUCN Red List of Threatened Species: Eusphyra blochii", "IUCN Red List of Threatened Species: Sphyrna corona", "IUCN Red List of Threatened Species: Sphyrna lewini", 10.2305/IUCN.UK.2006.RLTS.T60201A12317805.en, "IUCN Red List of Threatened Species: Sphyrna mokarran", "IUCN Red List of Threatened Species: Sphyrna tiburo", "IUCN Red List of Threatened Species: Sphyrna tudes", "IUCN Red List of Threatened Species: Sphyrna zygaena", "Statistics on Attacking Species of Shark", "Panamanian officials find half ton of shark fins", Sharks Highly respected in Hawaiian Culture, "Babies Of The S.E.A. The species reaches an average length of 13.1 feet (4 m) and weight of 500 pounds (230 kg). 1 Description 2 Obtaining 3 Abilities 4 Gallery 5 Navigation The Baby Hammerhead is a companion that is relatively powerful compared to the Reef and Mako Baby Sharks but is greatly outclassed by the baby sharks that follow. A fisherman caught a hammerhead on Longboat's shores. The developing embryos are at first sustained by a yolk sac. Usually, a litter consists of 12 to 15 pups, except for the great hammerhead, which gives birth to litters of 20 to 40 pups. A hammerhead shark uses its wide head to trap stingrays by pinning them to the seafloor. The hammerheads seem closely related to the carcharhinid sharks that evolved during the mid-Tertiary period. Hammerhead sharks are viviparous: they retain fertilized eggs within the body and give birth to live young—from 2 to 42. 2. Hawaiian children who are born with the hammerhead shark as an animal sign are believed to be warriors and are meant to sail the oceans. Fun Facts About The Hammerhead Shark Hammerheads frequently travel in packs, some of which may consist of 400 or more sharks (check the video below for an example). There are nine different species of hammerhead shark, and each has its own unique traits and adaptations. Research made by Joung (2004) identified this to be about 20 years, while Sminkey (1996) mention that sandbar sharks can live more than 30 years. What sense does the hammerhead shark depend on? The smaller bonnethead sharks have thicker, flattened crushing teeth and often prey on crabs, shrimp, and fishes buried in the sand. [31], In March 2013, three endangered, commercially valuable sharks, the hammerheads, the oceanic whitetip, and porbeagle, were added to Appendix II of CITES, bringing shark fishing and commerce of these species under licensing and regulation. In years with warm El Niño conditions, hammerhead sharks may range many hundreds of kilometres farther than normal. [39] Renowned artist Ken Thaiday Snr is known for his representations of beizam in his sculptural dari and other works. Learn about the scalloped hammerhead shark. [28] This practice, known as finning, is lethal to the shark. In contrast, larger hammerhead sharks possess sizable bladelike teeth and often prey on larger fishes, squid, small sharks, and stingrays. These cartilaginous fishes vary in size; the small scalloped bonnethead (S. corona) measures only 90 cm (35 inches) long, whereas the great hammerhead (S. … Sporting wide, flattened heads known as cephalofoils with eyeballs bulging at each end, hammerhead sharks are among the most recognizable fish in … This was the first shark known to do this. In fact, the great hammerhead specializes in hunting and eating large stingrays, and some members of this species have been found to have dozens of stingray barbs embedded in their flesh. Shark Pregnancy and Birth - Shark pregnancy involves a gestation period from several months to two years. Chief curator, Department of Natural Sciences, Oakland Museum of California. Like other sharks, fertilization is internal, with the male transferring sperm to the female through one of two intromittent organs called claspers. National Geographic explains that hammerheads can be found in warm tropical waters, but during the summer, they participate in a mass migration to search for cooler waters. Hammerheads have a sinister reputation of…, The oddest-looking sharks are the hammerheads (. Fins, skin, and teeth are also harvested from sphyrnids, and many larger hammerhead sharks are prized as sport fish. Like humans, hammerhead sharks are long-lived, reach maturity after several years, and have few babies. – Bonnethead Shark", "The Bonnethead Shark Sphyrna tiburo: Is it Suitable for Home Aquariums? This page was last edited on 10 December 2020, at 19:26. The most obvious distinguishing feature is the lateral expansion of the head in a hammer or bonnet form, with the eyes at the outer edges. Some authorities believe that this group emerged as early as the Eocene Epoch (roughly 56 million to 33.9 million years ago). Would you like to merge this question into it? [33] The larger hammerhead species can reach more than twice that size and are considered difficult, even compared to most other similar-sized sharks (such as Carcharhinus species, lemon shark, and sand tiger shark) regularly kept by public aquariums. Birth usually occurs during the spring and summer months, and females will usually give birth in shallow, protected coastal waters. It has the longest recorded reaching 20 feet long, which tends to be longer than you can imagine. As the name suggests, the great hammerhead is the largest of the 9 species. Other species of the hammerhead sharks are about 11 feet long and weigh around 500 pounds. Hammerhead sharks prey on a wide array of fish, cephalopods, and crustaceans, but specific prey varies between the different species. [31][34] As a consequence, relatively few public aquaria have kept them for long periods. Hammerheads are found worldwide in warmer waters along coastlines and continental shelves. Nonetheless, large hammerhead sharks should be respected and avoided by bathers and divers. The shark's eye placement, on each end of its very wide head, allows it to scan more area more quickly than other sharks can. Most hammerhead species are placed in the genus Sphyrna, while the winghead shark is placed in its own genus, Eusphyra. Even more, it has been demonstrated that the lifespan of sharks in captivity is considerably shorter from those in the wild, making impractical to generate conclusions from those individuals in captivity. But the one most people refer to is the great hammerhead shark. [32] Nevertheless, at up to 1.5 m (5 ft) in length and with highly specialized requirements, very few private aquarists have the experience and resources necessary to maintain a bonnethead in captivity. The sense that a hammerhead shark uses is their smell. The waters off Malpelo Island, Colombia, are home to a diverse marine life, which includes the scalloped hammerhead shark. (2011). [15], Hammerhead sharks eat a large range of prey such as fish (including other sharks), squid, octopus, and crustaceans. The pup is born and has to look after itself once it hatches. The age of a shark can be determined by counting the rings of more and less dense cartilage deposition on a vertebrae. Fishing methods include slow trolling, drifting, or still fishing with chum and baits that are oily or bloody. These baby sharks huddle together and swim toward warmer water until they are old enough and large enough to survive on their own. Stunning pictures show brave divers feeding frozen fish to some hungry great hammerhead sharks. Third, the extended spacing of the eyes may provide a wider field of view; it may also widen the lateral field of view and increase anterior depth perception. [17], According to the International Shark Attack File, humans have been subjects of 17 documented, unprovoked attacks by hammerhead sharks within the genus Sphyrna since 1580 AD. Smaller species produce just a few young, whereas the great hammerhead will give birth to several dozen. [citation needed], The known species range from 0.9 to 6.0 m (2 ft 11 in to 19 ft 8 in) in length and weigh from 3 to 580 kg (6.6 to 1,278.7 lb). [29], The relatively small bonnethead is regular at public aquariums, as it has proven easier to keep in captivity than the larger hammerhead species,[30][31] and it has been bred at a handful of facilities. [31] They are particularly vulnerable during transport between facilities, may rub on surfaces in tanks, and may collide with rocks, causing injuries to their heads, so they require very large, specially adapted tanks. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Second, the nostril is much expanded compared with other groups of sharks and may provide hammerhead sharks with a keener ability to locate prey and follow scents to their sources. Fossils show that hammerheads might have evolved earlier during the Paleocene. [8] [4] Their heads have lateral projections that give them a hammer-like shape. 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