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The fish they hunt are scarce and salamanders have poor eyesight. But sensory nodes on their head and body detect the slightest changes in water pressure. Free from competition, these giants can dine alone. Pickings are usually thin for the salamanders, but every year some of the world' s high rivers are crowded by millions of visitors. The salmon have arrived. This is the world' s largest fresh water fish migration. Across the northern hemisphere salmon, returning from the ocean to their spawning grounds, battle their way for hundreds of miles upstream. Up here, there are fewer predators to eat their eggs and fry. A grizzly bear. From famine to feast, he' s spoilt for choice. This Canadian bear is very special. He' s learnt to dive for his dinner. |
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tā men néng bǔ dào de yú lèi bù duō. tā men shì lì hěn chà, dàn shì tā men tóu shàng hé shēn tǐ shàng de gǎn jué qì kě yǐ gǎn dào shuǐ zhōng yā lì zuì wēi ruò de biàn huà. tā men méi yǒu jìng zhēng zhě, suǒ yǐ kě yǐ dān dú xiǎng shòu liè wù. yǐn sāi ní de shí wù lái yuán hěn shǎo, dàn shì jiè shang de mǒu xiē gāo shān hé liú měi nián dōu huì yǒng lái dà liàng de lái fǎng zhě. guī yú lái le. zhè shì shì jiè shang zuì dà guī mó de yú qún qiān xǐ huó dòng. zài zhěng gè běi bàn qiú, guī yú dōu huì jīng guò jìn qiān gōng lǐ de jiān nán huí yóu, sù liú ér shàng, cóng hǎi yáng fǎn huí dào chǎn luǎn dì. shàng yóu de zhèi xiē dì fāng, zhǐ yǒu shǎo shù shí ròu dòng wù lái chī tā men de luǎn hé hái zi. zhè shì yì zhī zōng xióng. tā kàn dào měi cān, jí bù kě nài le. jiā ná dà de zōng xióng fēi cháng tè bié, tā xué huì le qián shuǐ bǔ shí. |