Like humans, crows are more optimistic after making tools to solve a problem — Harvard Gazette
Inventive crows caught on camera making tools - CSMonitor.com
Cameras capture never-before-seen footage of wild crows building tools - The Washington Post
Crafty New Caledonian Crows Can Assemble Tools | Smart News| Smithsonian Magazine
New Caledonian crows' clearly profit from the care and craftsmanship they put into their tools – A new zoology thing for curious kids – 2 New Things
Tool-Making Crows | PBS LearningMedia
After Using Tools, Crows are Happier and Behave More Optimistically: 'The pleasure of accomplishment'
To lift a crow's mood, give it a toolkit
Canny crows know their tools
Tool use comes naturally to crows
Using Tools Puts Crows in a Good Mood | Inside Science
Making tools gives crows a big food boost | Ars Technica
Flying Free—Again – San Diego Zoo Wildlife Alliance Stories
Hawaiian Crows Join Tool-Users Club - The New York Times
IELTS EASY DEMO - New Caledonian Crow and The Use of Tools S12T4
Compound tool construction by New Caledonian crows | Scientific Reports
Beak or Tool | California Academy of Sciences
Like chess players, these crows can plan several steps ahead
Tool Use Puts New Caledonian Crows in a Good Mood/ Curr. Biol., Aug. 1, 2019 (Vol. 29, Issue 16) - YouTube
Tool-Making Crows Are Even Smarter Than We Thought | Nat Geo Wild - YouTube
Geometry of tool-holding in NC crows.(a) NC crows often hold tools... | Download Scientific Diagram
Unique beak evolved with tool use in New Caledonian crow | Cornell Chronicle
Can Crows Make Mental Pictures of Tools? - The New York Times
New Caledonian crows keep 'valuable' hooked tools safer than basic non-hooked tools | eLife
How Crows Use Tools to Solve Problems
Tool Use – Barbara C. Klump
