长颈鹿：长得高睡个觉也不容易啊
<p><span word="These">These</span> <span word="towering">towering</span> <span word="beasts">beasts</span> <span word="look">look</span> <span word="like">like</span> <span word="they">they</span> <span word="need">need</span> <span word="a">a</span> <span word="comfy">comfy</span> <span word="mattress">mattress</span> <span word="but">but</span> <span word="shut">shut</span>-<span word="eye">eye</span>'<span word="s">s</span> <span word="not">not</span> <span word="a">a</span> <span word="giraffe">giraffe</span>'<span word="s">s</span> <span word="biggest">biggest</span> <span word="concern">concern</span>.</p><p>长得像塔一样的长颈鹿看起来很需要一张舒服的床垫，不过睡觉不是长颈鹿要操心的大事。</p><p><span word="Just">Just</span> <span word="looking">looking</span> <span word="at">at</span> <span word="these">these</span> <span word="slumbering">slumbering</span> <span word="giraffes">giraffes</span> <span word="is">is</span> <span word="enough">enough</span> <span word="to">to</span> <span word="give">give</span> <span word="you">you</span> <span word="a">a</span> <span word="crick">crick</span> <span word="in">in</span> <span word="the">the</span> <span word="neck">neck</span> - <span word="which">which</span> <span word="is">is</span> <span word="why">why</span> <span word="the">the</span> <span word="world">world</span>'<span word="s">s</span> <span word="tallest">tallest</span> <span word="animals">animals</span> <span word="don">don</span>'<span word="t">t</span> <span word="often">often</span> <span word="stop">stop</span> <span word="for">for</span> <span word="a">a</span> <span word="snooze">snooze</span>.</p><p>看着这些睡觉的长颈鹿你都会觉得脖子累，这就是为什么这种世界上最高的动物通常不会随便停下打个盹儿。</p><p><span word="Despite">Despite</span> <span word="their">their</span> <span word="height">height</span>, <span word="giraffes">giraffes</span> <span word="actually">actually</span> <span word="have">have</span> <span word="the">the</span> <span word="shortest">shortest</span> <span word="sleep">sleep</span> <span word="requirement">requirement</span> <span word="of">of</span> <span word="all">all</span> <span word="mammals">mammals</span>, <span word="surviving">surviving</span> <span word="on">on</span> <span word="an">an</span> <span word="average">average</span> <span word="of">of</span> <span word="half">half</span> <span word="an">an</span> <span word="hour">hour</span> <span word="a">a</span> <span word="day">day</span>.</p><p>虽然长颈鹿长这么高，但是它们是所有哺乳动物里面睡得最少的，平均每天睡半个小时就够了。</p><p><span word="When">When</span> <span word="they">they</span> <span word="do">do</span> <span word="settle">settle</span> <span word="to">to</span> <span word="sleep">sleep</span>, <span word="it">it</span>'<span word="s">s</span> <span word="for">for</span> <span word="minutes">minutes</span> <span word="at">at</span> <span word="a">a</span> <span word="time">time</span>, <span word="because">because</span> <span word="of">of</span> <span word="the">the</span> <span word="risks">risks</span> <span word="to">to</span> <span word="their">their</span> <span word="wellbeing">wellbeing</span> <span word="in">in</span> <span word="the">the</span> <span word="wild">wild</span>.</p><p>当真的要睡觉的时候，它们一次只睡几分钟，因为在野外可不太安全。</p><p><span word="In">In</span> <span word="captivity">captivity</span>, <span word="the">the</span> <span word="giraffe">giraffe</span> <span word="sleeps">sleeps</span> <span word="intermittently">intermittently</span> <span word="around">around</span> 4.6 <span word="hours">hours</span> <span word="per">per</span> <span word="day">day</span>, <span word="mostly">mostly</span> <span word="at">at</span> <span word="night">night</span>. <span word="It">It</span> <span word="usually">usually</span> <span word="sleeps">sleeps</span> <span word="lying">lying</span> <span word="down">down</span>, <span word="however">however</span>, <span word="standing">standing</span> <span word="sleeps">sleeps</span> <span word="have">have</span> <span word="been">been</span> <span word="recorded">recorded</span>, <span word="particularly">particularly</span> <span word="in">in</span> <span word="older">older</span> <span word="individuals">individuals</span>.</p><p>笼子里的长颈鹿每天大约会断断续续地睡4.6小时，大部分时间是在晚上。它们一般会躺着睡，不过记录中也有站着睡的，特别是那些年纪大的。</p>
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