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<  O čom sa píše?  ~  Zvieratá sa nám v mnohom podobajú

Lemmy
Zaslal: Ne august 06, 2017 1:30 pm Odpovedať s citátom
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Založený: 17 január 2007 Príspevky: 6186 Bydlisko: Mám.
K článku Zvieratá sa nám v mnohom podobajú.


Behavioural Ecology Research Group napísal(a):
Wire-bending: first bend (QuickTime, 1.3 MB/WMV, 4.7 MB). This is a clip from trial 5 of the choice experiment, in which the birds were presented with a straight and a hooked piece of wire. The clip starts after the male (Abel) has removed the hooked wire, leaving only the straight one for the female (Betty) to manipulate. At the start of the clip, Betty already has the (straight) wire in her beak, but has not yet attempted to use it or bend it. Note that this is only their 5th experience with wire or any pliant material, and also the first time we saw any sort of bending behaviour. See the Cognition page for more details.

The right tool for the job napísal(a):
New Caledonian crows make and use complex tools in the wild, but this does not necessarily indicate that they are especially clever – it could be a largely instinctive behaviour, similar to the web-building of spiders. Our experiments (see Development) have indeed demonstrated that New Caledonian crows possess an inherited predisposition for tool use – so how smart are they really?

To assess animal intelligence, scientists often examine how individuals perform in novel situations, where evolution cannot have provided them with a built-in solution, and where they have not had a chance to learn what to do through trial-and-error. We have used this approach with our captive New Caledonian crows, by looking at how they select or make tools when faced with novel problems.

Firstly, we asked whether the crows could choose tools of appropriate dimensions (length and width) to get food. We placed food at different distances inside a transparent tube, and provided sticks of different lengths: we found that they nearly always chose sticks that were long enough to get the food (Chappell & Kacelnik 2002).

References

Chappell, J., & Kacelnik, A. (2002). Tool selectivity in a non-mammal, the New Caledonian crow (Corvus moneduloides). Animal Cognition, 5:71-78 DOI 10.1007/s10071-002-0130-2 PDF

Chappell, J., & Kacelnik, A. (2004). Selection of tool diameter by New Caledonian crows Corvus moneduloides. Animal Cognition, 7: 121-127. DOI 10.1007/s10071-003-0202-y PDF
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Lemmy
Zaslal: Ne august 06, 2017 1:40 pm Odpovedať s citátom
Súčasť inventára Súčasť inventára
Založený: 17 január 2007 Príspevky: 6186 Bydlisko: Mám.
Oplatí sa pozrieť aj videá od PLOS Media (Causal understanding of water displacement by a crow) alebo od BBC Earth (Are crows the ultimate problem solvers? – Inside the Animal Mind – BBC).
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