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　　1.**哺乳动物觅食

　　V1：GWD原题来着，那啥两种动物在哺乳期间用多少力气多少时间找食物来着，不知道是啥动物…

　　V2： 阅读，一个就是gwd原题，那个fast啊forage，一个动物哺乳期之类的怎么样，另一个怎么样，另一个有个特例，那个特例怎么样，那个特例为什么这么样。。。

　　考古(GWD原文已确认)

　　T-4-Q24~27： TS-7-33～36

　　Untilrecently， Zoologists believed that all species of phocids (true seals)， a pin-nipped family， use a different MATernal strategy than do otariids (fur seals and sea lions)， another pin niped family. Mother otariids use a foraging strategy. They acquire moderate energy stores in the form of blubber before arriving at breeding sites and then fast for 5 to 11 days after birth. Throughout the rest of the lACTation (milk production) period， which lasts from 4 months to 3 years depending on the species， mother otariids alternately forage at sea， where they replenish their fat stores ，and Nurse their young at breeding sites. Zoologists had assumed that females of all phocids species， by contrast， use a fasting strategy in which mother phocids， having accumulated large energy stores before they arrive at breeding sites， fast throughout the entire lACTation period， which lasts from 4 to 50 days depending on the species. However， recent studies on harbor seals， a phocids species， found that lACTating females commenced foraging APproxiMATely 6 days after giving birth and on average made 7 foraging trips during the remainder of their24-day lACTation period.

　　The MATernal strategy evolved by harbor seals may have to do with their small size and the large proportion of their fat stores depleted in lACTation. Harbor seal sare small compared with other phocids species such as GREy seals， all of which are known to fast for the entire lACTation period. Studies show that mother seals of these species use respectively 84 percent， 58 percent， and 33 percent oftheir fat stores during lACTation. By comparison， harbor seals use 80 percent of their fat stores in just the first 19 days of lACTation， even though they occasionally feed during this period. Since such a large proportion of their fat stores is exhausted despite feeding， mother harbor seals clearly cannot support all of lACTation using only energy stored before giving birth. Though smaller than many other phocids， harbor seals are similar in size to most otariids. In addition， there is already some evidence suggesting that the ringed seal， APhocids species that is similar in size to the harbor seal， may also use a MATernal foraging strategy.