the

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...and raises the alarm.
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...and raises the alarm. 提高警惕

alarm raises the and
But the snake is headed straight for her youngster.
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But the snake is headed straight for her youngster. 但是蛇直扑幼崽

snake headed youngster straight her for is the but
She spots the danger...
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She spots the danger... 它发现危险

spots danger she the
and silently pursuing their prey through the undergrowth.
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and silently pursuing their prey through the undergrowth. 以及悄无声息地 在下层灌木丛中追捕猎物

undergrowth pursuing silently prey through their the and
They lost the arms and legs of their reptilian ancestors
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They lost the arms and legs of their reptilian ancestors 它们失去了爬行动物祖先的四肢

reptilian ancestors arms legs lost their they of the and
The discarded skin of their ancient adversary.
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The discarded skin of their ancient adversary. 它们古老对手的蜕皮

adversary discarded skin ancient their of the
The snake.
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The snake. 蛇

snake the
Snakes evolved around the same time as the first true mammals.
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Snakes evolved around the same time as the first true mammals. 蛇的进化时间 与第一批真正的哺乳动物大致相同

snakes evolved true mammals same around time first as the
Crucial to the success of mammals
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Crucial to the success of mammals 哺乳动物成功的关键是

crucial success mammals of the to
was the evolution of parental care.
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was the evolution of parental care. 父母照护的进化

parental care evolution was of the