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Tiger sharks

Tiger sharks of the order Tiger Sharks

Edit this paragraph to explain one: real tiger sharks

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there are only 1 family, 1 genus and about 8 species of tiger shark in the English a bullhead shark order. The body is thick and short, and the head is nearly square. Obvious supraorbital protrusion, short and blunt kiss, small eyes, oval shape, upper position, no transient membrane. Nose has nasal groove. The mouth is flat and horizontal, and the upper and lower lips are pleated. The upper and lower teeth are of the same type, the front and back teeth of each jaw are irregular, the front teeth are pointed, and the teeth are 3 ~ 5 heads; The posterior teeth are flat and molar-shaped. The water spray hole is small and located behind the eye. There are 5 gill holes, and the last 3 ~ 4 are located above the base of pectoral fin. 2 dorsal fins, each with a hard spine; With gluteal fins; The caudal fin is wide and short, broom-shaped, the front of the lower leaf is triangular, and the caudal base is not concave; The pectoral fin is wide. Distributed in tropical and temperate waters of the Pacific Ocean and Indian Ocean. There are two species in China, the tiger shark with wide stripes and the tiger shark with narrow stripes.

Selachii (Heterodontidae) has only one genus-Heterodontus-a general term for all species. It is characterized in that the front edges of the two dorsal fins each have a thick hard spine. There are about 1 kinds. Marine products, benthos, can be found almost everywhere except the Mediterranean Sea and Atlantic Ocean. It can be up to 1.4 meters (5 feet) long. There are sharp teeth in both palates, incisors in front and molars on both sides. Feeding on invertebrates such as sea urchins and crustaceans.

Tiger sharks have fossil records as early as Paleozoic Carboniferous, which flourished most in Mesozoic and declined gradually in Cenozoic. It is a kind of small and medium-sized shark, which can reach 1.5 meters in length and is bulky. Habitat bottom, feeding on shellfish and crustaceans. Defend the enemy with dorsal fin spines. The body is yellow with black stripes, which is a warning color to avoid enemy harm. Tiger sharks lay two eggs at a time, and the eggs have conical horny sacs with spiral petals, and filaments are dragged at the end of the egg sacs to fix them on the attachments.

edit this paragraph to explain 2: the common name of Gully skunk shark

Gully skunk shark is commonly known as "Tiger shark". Tiger shark is a fierce and cruel carnivore second only to man-eating shark in shark family. One-year-old tiger sharks are already 38 centimeters long. Adult tiger sharks can grow to a maximum of about 9 meters. When hungry tiger sharks have a big appetite, as long as they find moving objects, they will chase after them and wait for an opportunity to launch an attack. Tiger sharks have a complicated diet.

Tiger shark is an oviparous animal. It is said that a female tiger shark can have 4 ~ 5 fetuses at a time. When the eggs hatch into larvae, they start to eat each other and fight until there is only one left. It happened in the past that a biologist was bitten by an unborn baby tiger shark while dissecting a pregnant tiger shark. Tiger shark's food is very messy. In addition to preying on shellfish, crustaceans and fish, sometimes people can swallow the garbage thrown into the sea and even the boards on the ship. Its sharp teeth can bite off and grind very hard objects, and people's lives are in danger if they are bitten by it.

Edit this paragraph to explain 3: F-2 "Tiger Shark"

The F-2 fighter launched by Northrop Corporation is actually an F-5E with improved performance. It looks quite similar to the F-5E in appearance, but in fact, the nose, air intake and engine of the aircraft have all been completely designed, with its basic lightweight configuration, in line with F44. In addition, Northrop is very ambitious, and wants to replace more than 2, F-5Es that have been delivered to the international market with F-2. Therefore, it has invested heavily in a full set of radar, F-5E control and avionics systems, so the F-2 fighter is almost a brand-new fighter, which is why the F-5G model will be replaced by the name of F-2 TigerShark in the end. However, the birth of the F-2 fighter was not smooth. Since the test flight on August 3, 1982, there have been two major accidents around the F-2, and three prototypes have damaged two. In the end, the F-16 market was cancelled by the U.S. government because of the accident and outstanding performance.