The hammerhead shark uses its head to pin down stingrays and eats the ray when the ray is weak and in shock. Hey, not all sharks are mean and This was the first shark known to do this. This shark's distinctive head is designed for greater agility and panoramic vision, making the hammerhead a hunter to be reckoned with. [6], Since sharks do not have mineralized bones and rarely fossilize, only their teeth are commonly found as fossils. This page was last edited on 4 February 2021, at 19:02. No human fatalities have been recorded.[27]. The width of the cephalofoil is 23–27% of the body length. [28] This practice, known as finning, is lethal to the shark. They are associated with law and order. Shark fins are prized as a delicacy in certain countries in Asia (such as China), and overfishing is putting many hammerhead sharks at risk of extinction. It can grow up to 20 feet in length and weigh up to 1,000 pounds, although smaller sizes are more common. respectively. This status review report is comprised of two components: (1) the “Status Review” of the species, a document that compiles the best available information on the status of the great hammerhead shark as required by the ESA, and (2 [16] In addition to the typical animal prey, bonnetheads have been found to feed on seagrass, which sometimes makes up as much as half their stomach contents. These baby sharks huddle together and swim toward warmer water until they are old enough and large enough to survive on their own. They are grayish in color, and sometimes have a green tint. 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). [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. There are 9 different species of hammerhead sharks, and all of them have odd shaped heads that look like flattened hammers – hence their name. Their extra-tall, pointed dorsal fins are easily identifiable. 1. [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. In the evening, like other sharks, they become solitary hunters. Hammerheads are aggressive hunters, feeding on smaller fish, octopuses, squid, and crustaceans. [38], Among Torres Strait Islanders, the hammerhead shark, known as the beizam, is a common family totem and often represented in cultural artefacts such as the elaborate headdresses worn for ceremonial dances, known as dhari or dari. (2011). And by spreading their highly specialized sensory organs over their wide, mallet-shaped head, they can more thoroughly scan the ocean for food. These sharks are often found swimming along the bottom of the ocean, stalking their prey. [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.
This field is for validation purposes and should be left unchanged. Reaching a length of 1.9 m (6.2 ft), this small brown to gray shark has a slender body with a tall, sickle-shaped first dorsal fin. Find hammerhead shark stock images in HD and millions of other royalty-free stock photos, illustrations and vectors in the Shutterstock collection. [10][11] The shape of the head was previously thought to help the shark find food, aiding in close-quarters maneuverability, and allowing sharp turning movement without losing stability. 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. The They do not actively seek out human prey, but are very defensive and will attack when provoked. [34] Great hammerheads have been kept at a few facilities in North America, including Atlantis Paradise Island Resort (Bahamas), Adventure Aquarium (New Jersey), Georgia Aquarium (Atlanta), Mote Marine Laboratory (Florida), and the Shark Reef at Mandalay Bay (Las Vegas). Next week is Shark Week! Froese, Rainer, and Daniel Pauly, eds. [5], Hammerheads have disproportionately small mouths compared to other shark species. The pores on the shark's head lead to sensory tubes, which detect electric fields generated by other living creatures. … Weight: 500 to 1,000 pounds A hammerhead shark uses its wide head to trap stingrays by pinning them to the seafloor. The average great hammerhead shark is up to 11.5 feet (3.5 m) long. While overall similar, this shape differs somewhat between species; e.g., a distinct T-shape in the great hammerhead, a rounded head with a central notch in the scalloped hammerhead, and an unnotched rounded head in the smooth hammerhead. From what is known about the winghead shark, the shape of the hammerhead apparently has to do with an evolved sensory function. Their bellies are white, which allows them to blend into the background when viewed from below, and sneak up on their prey. Shark attacks are rare on humans. [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. Their unique heads are used as a weapon when hunting down prey. These large sharks average about over 500 pounds (230 kg) but can weigh as much as 1,000 pounds (450 kg). While overall similar, this shape differs somewhat between species; e.g., a distinct T-shape in the great hammerhead, a rounded head wi… The largest reported was 20 feet (6 m) long. Some of these schools can be found near Malpelo Island in Colombia, the Galápagos Islands in Ecuador, Cocos Island off Costa Rica, near Molokai in Hawaii, and off southern and eastern Africa. Hi, everyone! [12] By distributing the receptors over a wider area, like a larger radio antenna, hammerheads can sweep for prey more effectively. It is very rare to find Hammerhead Sharks in the deep ocean, as they prefer to be in warm waters, on coastlines and continental shelves. They are gray-brown to olive-green on top with off-white undersides, and they have heavily serrated, triangular teeth. Description of the Hammerhead Shark Most species of hammerhead sharks have similar shapes and colorations. Length-Weight and Curved Fork-Total Length Relationships More Information Shark Research in the Northeast Narragansett Laboratory Directory Narragansett Lab Current Research and Features To Convert a Curved Fork Length (inches) to a Whole Weight [1], The hammer-like shape of the head may have evolved at least in part to enhance the animal's vision. The great hammerhead is the largest of the nine identified species of this shark. Stingrays are a particular favorite. The hammerhead's increased ampullae sensitivity allows it to find its favorite meal, stingrays, which usually bury themselves under the sand. [2][3] They are usually light gray and have a greenish tint. The winghead shark (Eusphyra blochii) is a species of hammerhead shark, and part of the family Sphyrnidae. Found worldwide in tropical waters near coastlines, the great hammerhead can be sighted near beaches and is considered a potentially dangerous shark to humans. The developing embryos are at first sustained by a yolk sac. 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. There are 9 species of hammerhead sharks, ranging in size from about 3 feet (0.9 m) long to over 20 feet (6 m). – Bonnethead Shark", "The Bonnethead Shark Sphyrna tiburo: Is it Suitable for Home Aquariums? 1 Smooth hammerhead sharks mate via internal fertilization and … Like all sharks, hammerheads have electroreceptory sensory pores called ampullae of Lorenzini. ~ Fun Fact ~ A great Hammerheads are found worldwide in warmer waters along coastlines and continental shelves. Hammerhead sharks are consummate predators that use their oddly shaped heads to improve their ability to find prey. The longest recorded great hammerhead shark was 6.1 m (20 ft.) in length. Rare footage shows an attack on a hammerhead shark by a tiger shark off the coast of Louisiana. Sharks and many other fish (both bony and cartilagenous like sharks) can have delayed fertilization. Great whites are among the most dangerous sharks. Most hammerhead species are fairly small and are considered harmless to humans. Hammerhead shark facts! [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. A hammerhead shark is any of the ten species that make up the Sphyrnidae family. Once the baby sharks are born, they are not taken care of by the parents in any way. The second-largest hammerhead next to the great hammerhead, the smooth hammerhead typically measures 2.5–3.5 m (8.2–11.5 ft) long, with a maximum recorded length and weight of 5 m (16 ft) and 400 kg (880 lb) respectively. [39] Renowned artist Ken Thaiday Snr is known for his representations of beizam in his sculptural dari and other works. These sharks are widely distributed in tropical and temperate marine waters near the coasts and above the continental shelves. [14], In 2007, the bonnethead shark was found to be capable of asexual reproduction via automictic parthenogenesis, in which a female's ovum fuses with a polar body to form a zygote without the need for a male. 2 The species is distinguished from other hammerheads by its nearly straight hammer-shaped head (cephalofoil) that has a prominent indentation in the middle. All rights reserved. Hammerhead Shark Distribution, Population, and Habitat These unique sharks live along the coastline and the continental plates. Wide-Set eyes give them a hammer-like shape shores all over the world kept scalloped hammerheads the. 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