BBC纪录片《非洲-大草原》第3集：第二胎只是备胎而已_BBC纪录片《地球系列之非洲》

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As their mother returns,

she sees what the larger chick has done.

The smaller chick seeks its mother‘s comfort.

But she has already made her choice.

Only her first-born will get a drink.

Shoebills very rarely raise mo石家庄癫痫病医院re than one chick.

The younger chick was only ever an insurance,

in case the elder didn‘t make it.

Now it‘s old enough, the adults know that

they‘re better off putting all their efforts

into bringing up just one fit and healthy youngster.

The swamp‘s changing water levels

mean fishing is too uedictable

for them to gamble on trying to raise two chicks.

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