The most crucial lives on the earth have to animals because they can't talk with humans. They can't tell their ideas or they can't tell about their cruel life for us.. I try to hear their voice...
I have studied about sharks last few weeks . Most people known sharks as dangerous animals , It's little bit wrong because all sharks are isn't dangerous so I hope this chapter will helpful for you to forget misunderstand about them .
Sharks . The name alone instils fear . These ancient beings have combed the depths since before the dinosaurs , placing them among the most fascinating creatures beneath the waves . Why then do they attract such stigma ? And should we really be scared of them ? Ever since Spielberg's Jaws hit the big screen in 1975 , sharks have attracted more fear than they have fascination - with myths and half-truths gaining attention ahead of facts and conservation . But with shark numbers now in sharp decline, it's time to get wise to these amazing creatures before it's too late . To help , I put together a guide on everything you need to know about sharks , so you can get to grips with just how wonderful and valuable they really are .
First : sharks are fish . Given the size of some species of shark , it's easy to see why some people mistake them for mammals , but they are indeed fish - albeit , very big ones ! The simplest way to determine a shark's fish pedigree is to note the gills just in front of the pectoral fins on the side of their body . As with al fish , these gills take in water , forcing it through lots of tiny blood vessels . These vessels absorb oxygen from the water , allowing sharks to breathe underwater without rising to the surface .
Clever, eh? Sharks account for some of the largest species of fish in our oceans , with the biggest being the mighty whale shark . These enormous fish can reach a length of 10 metres and weigh in at over 19 tonnes - the equivalent of 15 Ford Fiestas ! Basking sharks and megamouth sharks complete the top 3 biggest species , while the smallest known shark is the dwarf lantern shark , which averages just 6 inches in length .
There are over 1,000 species of sharks that we know of , with new species discovered every year . As our understanding of the seas and oceans widens , and technology continues to improve , it's guaranteed that hundreds of new shark species will be discovered in the coming years . Sadly , however , shark numbers are in decline , which is why organisations like the WWF are campaigning for greater conservation efforts to protect their numbers .
Every species of shark , from the great white to the bonnethead , plays a crucial role in our marine ecosystems - helping to balance a delicate natural order that would otherwise suffer . It's hoped that , as our understanding of sharks deepens and more countries introduce legislation to stop shark hunting, their numbers will return - as has been the case with several species of protected whales . The next few years will prove critical in safeguarding these incredible animals , with a view to not only discover more species , but protect those we already know about .
Sharks are opportunistic feeders , eating everything from small fish and invertebrates ( don't have backbone ) , to seals , penguins , sea birds, and whale carcasses . They detect their prey in several ways , including by sight , sound , vibration and , of course , smell – with a shark able to pick up the smell of blood from over a quarter of a mile away .
You'd be forgiven for thinking that larger shark species eat bigger prey , but this isn't always the case . Sure , a great white could pick off something as formidable as a leopard seal with ease, but bigger species , like basking and whale sharks , are filter feeders , preferring to munch on microscopic plankton . And , despite what films like Jaws may have led you to believe , sharks don't eat humans and would always prefer to stay out of our way . When attacks do happen , it's usually the case that a shark has got confused or feels threatened .
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Some sharks lay eggs and others give birth to live young . This is what's called 'viviparity' or 'ovoviviparity' ; there are more sharks which bear live young than those that lay eggs , and it differs from species to species . Take the whale shark for example , the classic example of ovoviviparity .
Here , this species produces eggs but doesn't lay them . Instead , the young hatch inside the female's body , only to emerge when they've reached a particular size . When we refer to viviparity , this is when a shark releases a capsule containing an egg and a yolk sac , with tendrils designed to anchor it to the seabed . When the baby sharks hatch inside the capsule , they get nutrition from the yolk sac , before eventually being released from the capsule . Some sharks , I like the shortfin mako , give birth in an altogether different way known as oophagy . This is when unfertilised eggs are 'eaten' by embryos inside the shark , before babies are released .
The biggest and most damaging myth about sharks is that they eat humans , which isn't true . When shark attacks happen , it's a matter of wrong place , wrong time - not of predator and prey . So , the next time you take a swim and start thinking about the them tune , put it out of your mind and remember : the likelihood of being attacked by a shark is 1 in 3.75 million .
Remove the fake fear you have to shark . They also should live in this planet not only us . Let's help to protect sharks!
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