{"fact":"One remarkable crow crafted tools with three and even four combined elements, demonstrating an unprecedented level of compound tool construction in non-human animals.","context":"One of them made 3- and 4-piece tools when required...Finally, one of the 3 tested individuals succeeded to manufacture tools out of 3 and even 4 elements.","source":"A. Bayern; A. M. P. Bayern; A. Bayern; S. Danel; S. Danel; A. Auersperg; A. Auersperg; A. Auersperg; B. Mioduszewska; A. Kacelnik, Compound tool construction by New Caledonian crows, 10.1038/s41598-018-33458-z","index":357}