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听力文稿 ( Transcript )
From the vast ocean off the coast of South Africa, Planet Carnivore delves into the cold water hunting ground of the ultimate ocean predator: The great white shark.
This morning, the Jack-Ass penguins are out early. This species is unique to Africa. But they are insulated like other penguins. Trapped in the winter where all year long. They get hot easily. And make their way to the water before the sun is high over head.
Dawn is when fish are closer to the sea surface, and when young male seals might be hunting. The early hours are when great white sharks hunt for seals.
So far, this robs stay beyond the High’s lethal reach. Today he is content to bask in the sun. High is still circling the island. She’s managed only snacks for closed two weeks and wants to catch a large seal off guard.
Great white sharks can be very patient. And High’s great size suggests that she is also skilled. Even with her deadly design, High prefers to ambush her victims. She locates one by using the millions of scent cells around her nostrils. Then tiny jelly-filled conductors on her snout allow her to pinpoint her living target by sensing its electrical field. When she is close enough to actually see what’s she is stalking, she sinks far below her unsuspecting prey.
Grown great white sharks are cleverly counter-shaded from dark grey to creamy white. Seen from beneath, they disappear into the bright surface. From above, they fade into the darker depth. The morning sun enhances the seal’s silhouette, and the undersea goon reduces her own. She doesn’t stay near the bottom very long.
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