ArticleRoyal Society open science2016
Tool bending in New Caledonian crows.
Article in Royal Society open science, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers, 1 of them a synthesis that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
11 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Meta-analytic techniques reveal that corvid causal reasoning in the Aesop's Fable paradigm is driven by trial-and-error learning.Animal cognition · 2018Pooled it
- The flexible, the stereotyped and the in-between: putting together the combinatory tool use origins hypothesis.Biological reviews of the Cambridge Philosophical Society · 2026Review
- Convergent evolution of complex cognition: Insights from the field of avian cognition into the study of self-awareness.Learning & behavior · 2021Review
- Using an Innovation Arena to compare wild-caught and laboratory Goffin's cockatoos.Scientific reports · 2020Article
- Spontaneous innovation of hook-bending and unbending in orangutans (Pongo abelii).Scientific reports · 2018Article
- Chimpanzees (PeerJ · 2018Article
- Preliminary observations of tool-processing behaviour in Hawaiian crowsCommunicative & integrative biology · 2018Article
- Do chimpanzees anticipate an object's weight? A field experiment on the kinematics of hammer-lifting movements in the nut-cracking Taï chimpanzees.Animal cognition · 2018Article
- Can hook-bending be let off the hook? Bending/unbending of pliant tools by cockatoos.Proceedings. Biological sciences · 2017Article
- The development of support intuitions and object causality in juvenile Eurasian jays (Garrulus glandarius).Scientific reports · 2017Article
- Goffin's cockatoos make the same tool type from different materials.Biology letters · 2016Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
5 authors.
Funding
Abstract
'Betty' the New Caledonian crow astonished the world when she 'spontaneously' bent straight pieces of garden wire into hooked foraging tools. Recent field experiments have revealed that tool bending is part of the species' natural behavioural repertoire, providing important context for interpreting Betty's iconic wire-bending feat. More generally, this discovery provides a compelling illustration of how natural history observations can inform laboratory-based research into the cognitive capacities of non-human animals.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.