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# Vervet monkey use different alarm calls to warn each other

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Re: Vervet monkeys use different alarm calls [#permalink]  28 Sep 2012, 04:38
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getgyan wrote:
Vervet monkeys use different alarm calls to warn each other of nearby predators, depending on whether the danger comes from land or from the air.
Which one of the following, if true, contributes most to an explanation of the behavior of vervet monkeys described above?

A. By varying the pitch of its alarm call, a vervet monkey can indicate the number of predators approaching.
B. Different land-based predators are responsible for different numbers of vervet monkey deaths.
C. No predators that pose a danger to vervet monkeys can attack both from land and from the air.
D. Vervet monkeys avoid land-based predators by climbing trees but avoid predation from the air by diving into foliage.
E. Certain land-based predators feed only on vervet monkeys, whereas every predator that attacks vervet monkeys from the air feeds on many different animals.

As ONLY that option justifies the need for DIFFERENT alarm calls, because they use different strategies to escape in different situations.
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Re: Vervet monkeys use different alarm calls [#permalink]  28 Sep 2012, 10:29
getgyan wrote:
Vervet monkeys use different alarm calls to warn each other of nearby predators, depending on whether the danger comes from land or from the air.
Which one of the following, if true, contributes most to an explanation of the behavior of vervet monkeys described above?

A. By varying the pitch of its alarm call, a vervet monkey can indicate the number of predators approaching.
B. Different land-based predators are responsible for different numbers of vervet monkey deaths.
C. No predators that pose a danger to vervet monkeys can attack both from land and from the air.
D. Vervet monkeys avoid land-based predators by climbing trees but avoid predation from the air by diving into foliage.
E. Certain land-based predators feed only on vervet monkeys, whereas every predator that attacks vervet monkeys from the air feeds on many different animals.

I was quite confused between C and D, ended up choosing D as D shows what actions other monkeys can take.
Probably it is an extension of C.
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Re: Vervet monkeys use different alarm calls [#permalink]  28 Sep 2012, 22:56
vivekdixit07 wrote:
I was quite confused between C and D, ended up choosing D as D shows what actions other monkeys can take.
Probably it is an extension of C.

Hi Vivek

Why do you think D is an extension of C?

Option C is an assumption of the stimuli but what is asked here is the reason which contributes most to an explanation of the behavior of vervet monkeys described above, which is done most effectively by Option D. Dont you think so?

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Re: Vervet monkeys use different alarm calls [#permalink]  28 Sep 2012, 23:32
1
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getgyan wrote:
Vervet monkeys use different alarm calls to warn each other of nearby predators, depending on whether the danger comes from land or from the air.
Which one of the following, if true, contributes most to an explanation of the behavior of vervet monkeys described above?

A. By varying the pitch of its alarm call, a vervet monkey can indicate the number of predators approaching.
B. Different land-based predators are responsible for different numbers of vervet monkey deaths.
C. No predators that pose a danger to vervet monkeys can attack both from land and from the air.
D. Vervet monkeys avoid land-based predators by climbing trees but avoid predation from the air by diving into foliage.
E. Certain land-based predators feed only on vervet monkeys, whereas every predator that attacks vervet monkeys from the air feeds on many different animals.

i dont believe in D because it unnecessarily gives an insight on how the monkeys save their lives.
Option C instead answer the behaviour of the monkeys reasoning WHY THEY HAVE TWO ALARMs.
the statememnt says: "Vervet monkeys use different alarm calls to warn each other " ,Here DIFFERENT is the catch word.
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Re: Vervet monkeys use different alarm calls [#permalink]  29 Sep 2012, 09:15
getgyan wrote:
Vervet monkeys use different alarm calls to warn each other of nearby predators, depending on whether the danger comes from land or from the air.
Which one of the following, if true, contributes most to an explanation of the behavior of vervet monkeys described above?

A. By varying the pitch of its alarm call, a vervet monkey can indicate the number of predators approaching.
B. Different land-based predators are responsible for different numbers of vervet monkey deaths.
C. No predators that pose a danger to vervet monkeys can attack both from land and from the air.
D. Vervet monkeys avoid land-based predators by climbing trees but avoid predation from the air by diving into foliage.
E. Certain land-based predators feed only on vervet monkeys, whereas every predator that attacks vervet monkeys from the air feeds on many different animals.

i dont believe in D because it unnecessarily gives an insight on how the monkeys save their lives.
Option C instead answer the behaviour of the monkeys reasoning WHY THEY HAVE TWO ALARMs.
the statememnt says: "Vervet monkeys use different alarm calls to warn each other " ,Here DIFFERENT is the catch word.

+1 D

Answer choice C mentions the characteristic or rather weakness of the predators by saying that no predators who pose a danger to vervet monkeys can attack both from land and air. There is no indication that because of the predator's mentioned incapability the velvet monkeys develop such behaviour.

On the other hand, answer choice D mentions that velvet monkeys develop such behaviour (use different alarm calls for land and air predator) to avoid the predator by climbing trees if land based predator and by diving into foliage if air based predator. Hence 'D' is the correct answer.

Press Kudos if you like my explanation
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Re: Vervet monkeys use different alarm calls [#permalink]  01 Oct 2012, 00:18
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i dont believe in D because it unnecessarily gives an insight on how the monkeys save their lives.

For that very reason, you should believe it. A monkey warns other monkeys by a sound. The other monkeys recognize the sound and they know whether they have to climb the tree or get down to foliage. That is the very purpose of the creation of those sound.
Option C instead answer the behaviour of the monkeys reasoning WHY THEY HAVE TWO ALARMs.

The discussion is not about Why they have TWO alarms rather the discussion is about why they have DIFFERENT alarms?
the statememnt says: "Vervet monkeys use different alarm calls to warn each other " ,Here DIFFERENT is the catch word.

Yes, I agree. DIFFERENT is the catch word. The discussion is why are the alarms not same, why are they DIFFERENT?

OA is D
Any other thoughts, please let me know

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Re: Vervet monkeys use different alarm calls [#permalink]  01 Oct 2012, 01:38
1
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Hi,

This is a 'resolve the paradox' question. The easiest way to deal with it is to ask, "Why do the velvet monkeys have different sounds?". Anything that explains that the best is the correct answer.

A. Nothing is mentioned about the number of predators in the stimulus.

B. Again, the number of predators is irrelevant.

C. This might seem to be a close choice. But think for a while, what if this is true? In that case, maybe there is no need for two different sounds.

D. This actually REQUIRES the need for different calls.

E. This is out of context here.

Hope this helps.

Regards,

Shouvik.
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Vervet monkeys use different alarm calls to warn each other [#permalink]  21 Jan 2013, 23:18
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Vervet monkeys use different alarm calls to warn each other of nearby predators,
depending on whether the danger comes from land or from the air.

Which one of the following, if true, contributes most to an explanation of the behavior of vervet monkeys
described above?

a) By varying the pitch of its alarm call, a vervet monkey can indicate the number of predators
approaching.
b) Different land-based predators are responsible for different numbers of vervet monkey
deaths.
c) No predators that pose a danger to vervet monkeys can attack both from land and from the
air.
d) Vervet monkeys avoid land-based predators by climbing trees but avoid predation from the
air by diving into foliage.
e) Certain land-based predators feed only on vervet monkeys, whereas
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Re: Vervet monkeys use [#permalink]  22 Jan 2013, 13:57
4
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Expert's post
amardeep03 wrote:
Vervet monkeys use different alarm calls to warn each other of nearby predators, depending on whether the danger comes from land or from the air. Which one of the following, if true, contributes most to an explanation of the behavior of vervet monkeys described above?
(A) By varying the pitch of its alarm call, a vervet monkey can indicate the number of predators approaching.
(B) Different land-based predators are responsible for different numbers of vervet monkey deaths.
(C) No predators that pose a danger to vervet monkeys can attack both from land and from the air.
(D) Vervet monkeys avoid land-based predators by climbing trees but avoid predation from the air by diving into foliage.
(E) Certain land-based predators feed only on vervet monkeys, whereas every predator that attacks vervet monkeys from the air feeds on many different animals.

BTW, you chopped off the end of answer (E) --- I had to find it on another site.
So, the vervet monkeys make a distinction --- one alarm for predators by land, and another for predators from the air. Why? Why two alarms? Why wouldn't just one generic alarm call --- "Predators!" ---- be sufficient?

(A) By varying the pitch of its alarm call, a vervet monkey can indicate the number of predators approaching.
The different calls distinguish the means by which the predator approaches, land or air, and has nothing to do with the number of predators. This completely changes the issue.

(B) Different land-based predators are responsible for different numbers of vervet monkey deaths.
If this were the case, we would expect different calls for different land-based predators --- this tells us nothing about the land/air distinction.

(C) No predators that pose a danger to vervet monkeys can attack both from land and from the air.
OK, this would mean there's no ambiguity in what each of the two calls means, but fundamentally doesn't explain why there would need to be two alarm calls instead of just one that means "predators!"

(D) Vervet monkeys avoid land-based predators by climbing trees but avoid predation from the air by diving into foliage.
Aha! The vervet monkeys take different evasive action, depending on whether the predator comes by air or by land --- thus, each alarm call would signal a unique evasive strategy appropriate to a predator from that medium. This make a great deal of sense.

(E) Certain land-based predators feed only on vervet monkeys, whereas every predator that attacks vervet monkeys from the air feeds on many different animals.
Whether other critters get eaten too is irrelevant to vervet monkeys trying to avoid getting eaten. The animal would not develop a difference in its alarm call to save some other species of animal.

The only sensible answer is (D).

Does all this make sense?

Mike
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Re: Vervet monkeys use different alarm calls to warn each other [#permalink]  08 Jul 2013, 15:13
D easy. IMO ,Seems a little too straightforward for a 700 level question.
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Re: Vervet monkeys use different alarm calls to warn each other [#permalink]  08 Jul 2013, 22:47
amardeep03 wrote:
Vervet monkeys use different alarm calls to warn each other of nearby predators,
depending on whether the danger comes from land or from the air. Which one of the
following, if true, contributes most to an explanation of the behavior of vervet monkeys
described above?

a) By varying the pitch of its alarm call, a vervet monkey can indicate the number of predators
approaching.
b) Different land-based predators are responsible for different numbers of vervet monkey
deaths.
c) No predators that pose a danger to vervet monkeys can attack both from land and from the
air.
d) Vervet monkeys avoid land-based predators by climbing trees but avoid predation from the
air by diving into foliage.
e) Certain land-based predators feed only on vervet monkeys, whereas

On another Day with other choices C could well be the answer Bravo. One more shot at 800.

Last edited by Narenn on 09 Jul 2013, 10:54, edited 1 time in total.
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