Not so bird-brained after all! Crows can count 'out loud' just like humans, 熟考する／考慮する finds

  • Crows can 支配（する）／統制する the number of vocalisations they produce, 'counting' up to 4?
  • The ability to count out loud 要求するs an understanding of 数値／数字による 量s

By Xantha Leatham 副 Science Editor For The Daily Mail

Published: | Updated:

They're already known as one of the smartest animals in the world.

Now, 専門家s have discovered that crows can even count out loud ? in a 類似の way to human toddlers.

In 実験s, 研究員s have 設立する that the birds can 支配（する）／統制する the number of vocalisations they produce, 'counting' up to four in 返答 to cues.

The ability to count out loud, reciting 'one, two three…' 要求するs an understanding of 数値／数字による 量s and purposeful 声の 支配（する）／統制する.

Humans use speech to symbolically count and communicate 量s, a コンビナート／複合体 技術 developed in childhood.

They're already known as one of the smartest animals in the world. Now, experts have discovered that crows can even count out loud ? in a similar way to human toddlers

They're already known as one of the smartest animals in the world. Now, 専門家s have discovered that crows can even count out loud ? in a 類似の way to human toddlers

Before mastering 象徴的な counting, where 明確な／細部 words relate to 明確な／細部 量s, toddlers will often produce a number of speech sounds that match the 量 of 反対するs they see.

研究員s from the University of Tubingen in Germany trained three crows to produce between one and four vocalisations in 返答 to both visual and auditory cues.

In each 裁判，公判, crows had to produce a 確かな number of vocalizations and 示す the end of the 声の sequence by つつく／ペックing at a 的.

The authors 設立する that the crows could produce 明確な／細部 numbers of vocalizations 首尾よく and deliberately in 返答 to 明確な／細部 cues ? a degree of 支配（する）／統制する not yet 観察するd in other animals.

によれば the findings, published in the 定期刊行物 Science, the birds appeared to 計画（する） the number of vocalisations before starting.

分析 also showed that the first vocalisation's タイミング and features 予報するd the 全体にわたる 'number' they were about to count to, while each 'number' had different acoustic features compared to others.

This is 類似の to how 'one', 'two', 'three' and 'four' sound different in human speech.

'This competency in crows also mirrors toddlers' enumeration 技術s before they learn to understand 枢機けい／主要な number words and may therefore 構成する an evolutionary precursor of true counting where numbers are part of a combinatorial symbol system,' the 研究員s said.

Previous 熟考する／考慮するs have 設立する that crows are 'just as clever as apes' when it comes to thinking logistically and using 道具s.

This 含むs abilities such as 延期する of gratification and 推論する／理由ing, 同様に as the ability to recognise themselves in the mirror and feel empathy.

WHY CROWS ARE AS SMART AS CHILDREN

Crows have a 推論する／理由ing ability rivalling that of a human seven-year-old, 研究 has shown.

Scientists （機の）カム to the 結論 after 支配するing six wild New Caledonian crows to a 殴打／砲列 of 実験（する）s designed to challenge their understanding of 原因（となる） and 影響.

The 仕事s were all variations of the Aesop's fable, in which a thirsty crow 減少（する）s 石／投石するs to raise the level of water in a 投手.

In the 'water 排水（気）量 仕事', crows worked out how to catch floating food rewards by dropping 激しい 反対するs into water-filled tubes.

They 論証するd an ability to 減少（する） 沈むing rather than floating 反対するs, solid rather than hollow 反対するs, to choose a high water level tube over one with low water level, and a water-filled tube over one filled with sand.

The birds' understanding of the 影響s of 容積／容量 排水（気）量 matched that of human children 老年の between five and seven, scientists from the University of Auckland （人命などを）奪う，主張するd.?