{"fact":"Unlike New Caledonian crows, Hawaiian crows don't seem to standardize their tools, using various plant materials of different sizes and shapes.","context":"The videos show that adult crows chose tools of appropriate length or shortened overly long twigs. However, unlike New Caledonian crows, the Hawaiian crows did not appear to standardize their tools, as they used plant materials of many sizes and shapes.","source":"Natalie Uomini; Gavin Hunt, A new tool-using bird to crow about, 10.3758/s13420-017-0262-5","index":514}