{"fact":"New Caledonian crows don't just use tools, they carefully craft them!  Their pandanus leaf tools feature a stepped design, and the number of steps varies between different crow populations, hinting at cultural learning.","context":"These pandanus tools are particularly impressive due to their\nstepped design: crows cut steps into the edge of pandanus leaf tools as they fashion\nthem, with the number of steps cut into the leaf edges showing large variation\nbetween populations.","source":"Alex H. Taylor; Sarah Jelbert, The crow in the room: New Caledonian crows offer insight into the necessary and sufficient conditions for cumulative cultural evolution, 10.1017/s0140525x20000102","index":525}