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And if a female replies, they pair up, posing like statues.
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And if a female replies, they pair up, posing like statues. 如果有雌企鹅回应, 它们就结成一对,共同摆出雕像般的姿势

swarms join up with other swarms
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swarms join up with other swarms 一团蝗虫云也会和其它蝗虫云汇合

It's a rare chance for them to build up their food reserves.
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It's a rare chance for them to build up their food reserves. 这是它们仅有的积累食物储备的机会

sucking up the water as soon as it appears.
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sucking up the water as soon as it appears. 水一边流淌一边被它吸去

but this herd concentrates on digging up the roots,
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but this herd concentrates on digging up the roots, 但这群象却忙着挖掘草根

that these elephants walk up to 50 miles a day
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that these elephants walk up to 50 miles a day 所以这些大象每天得走上50英里

as they travel up the dry river channels searching for something to eat.
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as they travel up the dry river channels searching for something to eat. 沿着干涸的河床搜寻一些可以吃的东西

As the day warms up,
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As the day warms up, 随着白天气温的升高

and they are squaring up for a duel.
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and they are squaring up for a duel. 它们正摆好架势准备激战

When full, a saguaro stem can store up to five tonnes of water
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When full, a saguaro stem can store up to five tonnes of water 吸饱水后 弁庆柱的茎干中 已储存了5吨左右的水