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The song of the yellow warbler

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Manager
Joined: 30 Apr 2016
Posts: 62
Location: India
GMAT 1: 720 Q50 V38
GPA: 4
The song of the yellow warbler  [#permalink]

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24 May 2017, 23:17
3
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Difficulty:

35% (medium)

Question Stats:

79% (02:11) correct 21% (02:05) wrong based on 113 sessions

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The song of the yellow warbler signals to other yellow warblers that a particular area has been appropriated by the singer as its own feeding territory. Although the singing deters other yellow warblers from taking over the feeding territory of the singer, other yellow warblers may range for food within a portion of the singer’s territory. However, a warbler sings a special song when it molts (sheds its feathers). Other yellow warblers will not enter the smaller core territory of a yellow warbler singing its molting song. Therefore yellow warblers, which can only fly short distances during molting, have no competition for the food supply within the range of their restricted flying. The argument makes which one of the following assumptions?

(A) The core areas contain just enough food to sustain one yellow warbler while it molts.
(B) Warblers are the only molting birds that lay claim to core areas of feeding territories by singing.
(C) There are no birds other than yellow warblers that compete with yellow warblers for food.
(D) Warblers often share their feeding areas with other kinds of birds, which often do not eat the same insects or seeds as warblers do.
(E) The core areas of each feeding territory are the same size for each molting warbler.
Manager
Joined: 21 Nov 2014
Posts: 53
Location: India
Schools: ISB '18
GMAT 1: 710 Q49 V38
GPA: 3.7
Re: The song of the yellow warbler  [#permalink]

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24 May 2017, 23:26
C. Yellow warblers don't intrude a fellow warbler's area when it is molting but we can't be sure that other birds also follow this no intrusion policy. Hence the conclusion that the molting bird will not face any food shortage in its territory is dependent on the behaviour of other birds
Manager
Joined: 30 Apr 2016
Posts: 62
Location: India
GMAT 1: 720 Q50 V38
GPA: 4
Re: The song of the yellow warbler  [#permalink]

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24 May 2017, 23:34
deep14 wrote:
C. Yellow warblers don't intrude a fellow warbler's area when it is molting but we can't be sure that other birds also follow this no intrusion policy. Hence the conclusion that the molting bird will not face any food shortage in its territory is dependent on the behaviour of other birds

what is the problem with option D?
Manager
Joined: 21 Nov 2014
Posts: 53
Location: India
Schools: ISB '18
GMAT 1: 710 Q49 V38
GPA: 3.7
Re: The song of the yellow warbler  [#permalink]

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24 May 2017, 23:44
2
aurobindomahanty wrote:
deep14 wrote:
C. Yellow warblers don't intrude a fellow warbler's area when it is molting but we can't be sure that other birds also follow this no intrusion policy. Hence the conclusion that the molting bird will not face any food shortage in its territory is dependent on the behaviour of other birds

what is the problem with option D?

The problem with D is that it says although warblers share territory with other birds, those other birds often do not eat the same insects or seeds as warblers do. That word often is weakening the assumption as often doesn't rule the instance in which other birds prey upon warbler's food. D would have been a valid choice if you drop often
Re: The song of the yellow warbler &nbs [#permalink] 24 May 2017, 23:44
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The song of the yellow warbler

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