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Unlike any other bird, the hummingbird has ball-and-socket shoulder jo

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Unlike any other bird, the hummingbird has ball-and-socket shoulder jo  [#permalink]

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New post Updated on: 05 Apr 2019, 05:06
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A
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Question Stats:

44% (01:46) correct 56% (01:51) wrong based on 121 sessions

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Unlike any other bird, the hummingbird has ball-and-socket shoulder joints that allow it to rotate its wings 180 degrees in all directions. Hummingbirds also have the unique ability to perform several feats of acrobatic flight, such as flying backward, flying upside-down, and hovering.

If the above statements are true, they provide the most support for which of the following claims?

A. Some birds cannot hover.
B. It is not possible for a bird without ball-and-socket shoulder joints to fly backward or upside-down.
C. Birds without ball-and-socket shoulder joints develop alternative modes of acrobatic flight.
D. Birds that cannot perform acrobatic feats have no need to rotate their wings 180 degrees in all directions.
E. When other birds engage in acrobatic flight, their wings rotate less than 180 degrees.

Spoiler: :: My doubt
Unlike any other bird - assumption - hummingbird is the only one with the activities
So A) is obviously wrong choice - The correct inference would have been "no other" bird can hover - isn't it? It is only HB which can..
B) HB "also" have ability implies that the first sentence is connected to the second - also assumes link between ball and socket with unique ability - inference thus - what is stated
The others are off topic

Originally posted by DebbieChats on 05 Apr 2019, 02:01.
Last edited by nightblade354 on 05 Apr 2019, 05:06, edited 2 times in total.
Renamed the topic and edited the question.
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Re: Unlike any other bird, the hummingbird has ball-and-socket shoulder jo  [#permalink]

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New post 05 Apr 2019, 03:40
DebbieChats, Can you remove the off topic and other doubts you have from the answer options and ask in the spoiler?
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Re: Unlike any other bird, the hummingbird has ball-and-socket shoulder jo  [#permalink]

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New post 10 Apr 2019, 09:16
A detailed explanation, please?
IMO B is correct as "unlike other birds" is used and secondly "unique abilities" is mentioned, both of which signify that only hummingbirds perform can these activities.
Option A refutes the argument by using "some". "None of the other" would have been an equally valid choice?

Please share your thoughts.
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Re: Unlike any other bird, the hummingbird has ball-and-socket shoulder jo  [#permalink]

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New post 11 Apr 2019, 11:15
Hi,
Could an expert provide his opinion about this one... I chose B, because I focused on the phrases"unlike any other bird and" and "unique ability to perform..." so I I thought A is wrong, because by some we assume that there is a number of birds that can actually do those things, thus eventually contradicts with the stem right?
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Unlike any other bird, the hummingbird has ball-and-socket shoulder jo  [#permalink]

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New post 11 Apr 2019, 12:12
Humming birds have the unique ability to perform "hovering". That definitely means there are some birds who can not hover.
Option A follows and is the answer.
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Unlike any other bird, the hummingbird has ball-and-socket shoulder jo  [#permalink]

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New post 11 Apr 2019, 13:40
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ajmekal wrote:
A detailed explanation, please?
IMO B is correct as "unlike other birds" is used and secondly "unique abilities" is mentioned, both of which signify that only hummingbirds perform can these activities.
Option A refutes the argument by using "some". "None of the other" would have been an equally valid choice?

Please share your thoughts.

Great question ajmekal, and here's the thing to be aware of regarding the use of the word "some."

"Some" can represent any plural number.

If it is true that very few people like swimming, then "some people" like swimming.

If it is true that most people like swimming, then "some people" like swimming.

If it is true that all people like swimming, then still, "some people" like swimming.

At the same time, people don't necessarily think of "some" as representing "all" or "most." "Some" has multiple connotations, and can be perceived as representing a relatively small fractional proportion of a total.

Because "some" has these connotations, it is used in GMAT Critical Reasoning questions to obscure the meanings of choices, and to make incorrect answers seem correct and correct answers seem incorrect.

In this case, the idea is that all birds other than the hummingbird cannot hover. Clearly, if all birds other than the hummingbird cannot hover, then it is true that some birds cannot hover.

So, if you agree that the passage indicates that only hummingbirds can hover, which inference is actually somewhat debatable, then (A) is correct.

(Whether choice (A) is actually correct is debatable, as the passage could be interpreted as saying that only the hummingbird can perform all of the "several feats of acrobatic flight," leaving open the possibility that other birds can perform one or more of those feats, just not all of these feats.)
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Re: Unlike any other bird, the hummingbird has ball-and-socket shoulder jo  [#permalink]

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New post 11 Apr 2019, 20:49
sayan640 wrote:
Humming birds have the unique ability to perform "hovering". That definitely means there are some birds who can not hover.
Option A follows and is the answer.
VeritasKarishma /
GMATNinja right ?

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Yes, you are right. It certainly seems that this is what the test maker wanted you to infer. But I certainly feel an ambiguity in the way it is written.

Is the ability to perform several feats unique (other birds can perform one or two of them but not several)? Or is the ability to perform each of those feats unique (no other bird can hover, no other bird can fly backwards etc)?
Though if all birds could hover, one would not be able to say that it is a "feat of acrobatic flight". It would be just a part of flying.
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Re: Unlike any other bird, the hummingbird has ball-and-socket shoulder jo   [#permalink] 11 Apr 2019, 20:49
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