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# Vervet monkey use different alarm calls to warn each other

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Vervet monkey use different alarm calls to warn each other [#permalink]  05 Oct 2006, 06:00
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Question Stats:

71% (01:49) correct 28% (00:23) wrong based on 7 sessions
Vervet monkey 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-dased 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.
Director
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E is my answer. I will explain if it's right.
Director
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I think it is between C and D . C looks like an assumption rather than explanation.
Think it is D
Director
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Sorry it should be D only. I see it now.
Current Student
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D seems like a trap. This describes the monkey's reactions, not necessarily their warning mechanisms.

If a predator of the velvet monkies attacked from both the land and air, how could the monkeys issue a different warning signal?

Senior Manager
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Looks Like D

From the statement we can make out that the monkeys have two signals.
Based on the stem C is a safe assumption to make but it doesn't explain their behavior.

D states their behavior. It ties the the direction they move to the warning calls when attacked by a predator and fits best with the stem.
VP
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"depending on whether the danger comes from land or from the air"

For the above reason C...
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Manager
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(C) it is. The answer should explain "why monkey use different alarm calls to warn each other of nearby predators" .Because they beleive that "No predators that pose a danger to vervet monkeys can attack both from land and from the air." Yes,one can look at it as an assumption but (D) does not explain the cause of this behavior infact it describes the behavior.
What is the OA ?
Manager
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C it is

The main point here is that the monkey should be able to distinguish between land attack and air attack.

The vervet monkey distinguishes between land attack and air attack based on the predator. If the same predator could attack from both land and air, the monkey would not be able to distinguish between the two. Hence it is essential that a predator is not able to attack from both land and air.
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I will also go for C
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Intern
Joined: 25 Sep 2006
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would go for d

here's why-
Vervets use different calls to warn each other of nearby predators.
it is 'predators' and not necessarily 'actual attack'

as for C, a predator ( as in singular) with dual attack capabilities cannot attack from air and land at the SAME time. the attack will come from one or the other location. BUT different kinds of predators can attack simultaneously , say some from the land and some from the sky.

a potential problem with D (also shared by C) is that vervets could issue both type of calls for 'different' predators - one for those in the nearby skies and another for those on the ground. then where do vervets go?

oe pls
VP
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D definitely.
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Re: CR Vervet monkeys ( Resolve paradox type) [#permalink]  05 Oct 2006, 17:41
laxieqv wrote:
Vervet monkey 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-dased 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.

D.
this explains that since the defense mechanism to be used are different, vervet monkeys have different alarm signals.
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muddypaws wrote:

as for C, a predator ( as in singular) with dual attack capabilities cannot attack from air and land at the SAME time.

That's not necessarily true. How about attacks from other "flying monkeys" ??
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OA is D ...we have insightful explanations in this thread

Btw, it's Mid-autumn festival in several parts of the world now ( Mainly in China, Vietnam, Malaysia, Singapore, Korea) so let's savor some mooncakes, sip cups of tea and fancy the roundest Moon of the year
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Manager
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laxieqv wrote:
OA is D ...we have insightful explanations in this thread

Btw, it's Mid-autumn festival in several parts of the world now ( Mainly in China, Vietnam, Malaysia, Singapore, Korea) so let's savor some mooncakes, sip cups of tea and fancy the roundest Moon of the year

Hi laxieqv

are you from one of the country mentioned above ?

Happy Mooncake Festival...~
SVP
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I'm in the first, from the second and will be in the third

So you're in Taiwan?!! ...Happy Mid-autumn day to you!! ^^
Senior Manager
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Damn they look yummy Laxie !! Have one for each one of us
Director
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Clear D, though C also looks like an option.

The need for distinct calls is to alert the other monkeys to take appropriate cover. So, while C explains that there are either land based or air based predators, it does not explain the rationale to distinguish between the two.
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Vervet monkeys use different alarm calls to warn each other [#permalink]  28 Sep 2012, 03:52
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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 every predator that attacks vervet monkeys from the air feeds on many different animals.
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Last edited by getgyan on 01 Oct 2012, 00:02, edited 1 time in total.
Vervet monkeys use different alarm calls to warn each other   [#permalink] 28 Sep 2012, 03:52
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