{"fact":"In a tool-use experiment, Betty the crow sometimes used a twig or feather instead of the provided aluminum strip, suggesting a preference or strategic choice based on available resources.","context":"out of the nine remaining trials, in four she retrieved the bucket using a twig or feather she brought into the testing room with her, rather than the metal strip","source":"Alex A. S. Weir; Alex Kacelnik, A New Caledonian crow (Corvus moneduloides) creatively re-designs tools by bending or unbending aluminium strips, 10.1007/s10071-006-0052-5","index":191}