Crows demonstrate their cleverness with tools (w/ Video)

Crows demonstrate their cleverness with tools
New Caledonian crow.
( -- New Zealand scientists studying New Caledonian crows have found they can use three different tools in succession to gain a food treat. The crows are known to solve problems and fashion and use tools in the wild, but their clevernes and innovation in the experiments astounded the researchers.

Investigations into the abilities of the New Caledonian crow (Corvus moneduloides) revealed the birds can create tools out of unfamiliar materials, and they can also use several tools in succession. The scientists, led by Professor Russell Gray from the University of Auckland, captured seven wild crows and placed them in an aviary where they were presented with a complex problem in which meat was placed out of reach. It could be drawn out by a long stick, but the stick was out of reach inside a barred toolbox. The long stick could be retrieved using a short stick, but this was attached to a string tied to a branch. So to win the treat, the birds had to first pull up the string to retrieve the short stick, then use the short stick to pull out the long stick, and then use the long stick to draw out the meat.

The crows were split into two groups. Birds in the first group were allowed to try out every step in the problem before being presented with the complete task. All the birds in this group succeeded in the multi-stage task on their first attempt.

Birds in the second group were shown situations in which food was attached to a string and where sticks could be used to reach food, but they had never experienced a situation in which one was used to collect another. Even so, the birds in this group also succeeded in reaching the food in the multi-stage task, although two of them took three or four attempts before they succeeded. One of the birds (nicknamed Sam) spent the first 110 seconds simply inspecting the parts of the task, and then completed it the first time without error. Another (Casper) found the string puzzling, but also completed the task on the first attempt.

Sam's successful first trial

Lead author of the research, published in the Proceedings of the Royal Society B, was Dr Alex Taylor. He said finding the birds could solve a problem requiring two new behaviors was “incredibly surprising,” even though and related birds have been studied for decades because of their intelligence. The experiments showed the performance of the in solving the problem was consistent with a thought process — tools can be used to retrieve unreachable objects — rather than a process of trial and error and learning from mistakes.

Russell Gray talks about New Caledonian crows and cognition.

Explore further

Wild crows reveal tool skills

More information: Complex cognition and behavioural innovation in New Caledonian crows, Alex H. Taylor et al., Proceedings of the Royal Society B, Published online before print April 21, 2010, doi:10.1098/rspb.2010.0285

Earlier story: Crows can use 'up to three tools' -

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Citation: Crows demonstrate their cleverness with tools (w/ Video) (2010, April 22) retrieved 24 May 2019 from
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User comments

Apr 22, 2010
Next time someone calls you a "bird-brain", you'll know that they just labeled you as more intelligent than they are.

Apr 22, 2010
I thought I had seen an article here in physorg which described research that discovered that the "weird" structure of the avian brain is actually very highy evolved and efficient, much more so than in mammals.

I once saw a sparrow hover in from of the motion detector in front of a drugstore. The door opened automatically and then the bird flew in and repeated the same with the inner door in the foyer. This story is true and I always wondered what 'scrip it was getting filled ;)

Apr 22, 2010
I saw a video over 20 years ago taken in the UK (if I recall correctly) where sparrows (or a common small bird in the UK) could figure how to remove pins from traps doors which allow the food contained behind the door to slide down to another trap door where it had to repeat the process.

There were more than 15 trap doors with slides and the pins were not in any order, but had to be "discovered"

They were pretty quick at this task!

Apr 22, 2010
At 1:02, is that the crow making a noise as if it's impatient?

Apr 24, 2010
crows are traied up there .!
any specie can be trained to make it usefull,
except scientists ..!

May 01, 2010
I've personally observed a crow work his way into a wire mesh garbage can for the remains of a potato bag. While we golfers watched, another crow retrieved another snake from the cubby of the golf cart (which appeared was their goal). It was spooky how intelligent these birds appear to be.

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