Showing posts with label Shark. Show all posts
Showing posts with label Shark. Show all posts

Sunday, 4 September 2011

Zebra Shark


Natural Wild Life | Zebra Shark | The zebra shark is a medium-sized species of shark, that is found in the warmer coastal waters and around tropical coral reefs. Zebra sharks are most commonly found in the Indian and South Pacific oceans. Zebra sharks can grow to nearly 3 meters in length and can get to be 30 years old in the wild. Zebra sharks that are kept in captivity generally do not exceed 15 years of age. Zebra sharks can be identified by the yellow spots that are present on the back of the zebra shark.


Zebra sharks have a long, flattened body which helps them to remain unnoticed on the seabed. The zebra shark also has a long tail which allows it to be more agile in the water. Zebra sharks move their tails from side to side when they swim, in an eel-like manner. Zebra sharks are omnivorous animals but tend to have a more meat-based diet. Zebra sharks feed on small fish, crabs, shrimp, snails and other small invertebrates along with squid and sea snakes which they forage for in the coral reefs.


Due to their relatively large size, zebra sharks have few natural predators as they are fairly dominant predators in their environment. Larger species of shark such as tiger sharks and bull sharks are the main predators of the zebra shark, along with humans who hunt them for their meat and fins. The female zebra shark lays an average of ten large eggs which hatch after an incubation period of around 5 months. The baby zebra sharks are nearly half a meter long when they first hatch.

Saturday, 3 September 2011

Hammerhead Shark


Natural Wild Life | Hammerhead Shark | Hammerhead Sharks are appropriately named after their flat shaped heads. Hammerhead sharks are large carnivorous fish that prey on large fish and occasionally hammerhead sharks will hunt small water mammals. Hammerhead sharks are found in the warmer waters of oceans worldwide but hammerhead sharks are particularly found in coastal waters, and along continental shelves. The shallow waters that the hammerhead sharks inhabit allow the hammerhead shark to hunt prey more easily. There are 9 different species of hammerhead shark worldwide, ranging from 3ft to 20ft in length! Hammerhead sharks are not commonly known to attack humans but can be aggressive if a human came into contact with a hammerhead shark.


The flat shaped head of the hammerhead shark is thought to allow the hammerhead shark to detect prey more easily, as it increases the hammerhead sharks sensitivity to sonar activity. Hammerhead sharks are thought to use sonar waves detection in a similar way to their five main senses, so its like the hammerhead shark has a sixth sense. The shape of the head of the hammerhead shark is made up of two projections on either side of the face of the hammerhead shark, which gives the hammerhead shark the head shape that resembles a hammer almost rectangular in shape. The eyes and nostrils of the hammerhead shark are found at the ends of the hammer allowing the hammerhead shark to have better vision and smell of the surrounding water.


Like many other species of shark the hammerhead shark is a solitary hunter during the night, but during the daytime hammerhead sharks are known to form schools of up to 100 hammerhead shark individuals. Hammerhead sharks are commonly seen in larger groups during the summer months when the hammerhead sharks are migrating together in search of cooler waters. The great hammerhead shark is the largest species of hammerhead shark and one of the few species of hammerhead shark that is potentially dangerous to humans. This is due to the sheer size of the giant hammerhead shark and also because the giant hammerhead is known to have an aggressive temperament. Other species of hammerhead shark tend to pose little or no threat to humans as these species of hammerhead shark are generally much smaller than the giant hammerhead shark and are slightly calmer in their nature.