{"fact":"Crows aren't always efficient! In one test, a crow tried to squeeze through a too-small hole a whopping 33 times.","context":"\"Dyatel,\" in the sixth trial, approached an unsuitable hole and tried to pass through it 33 times.","source":"Ivan A. Khvatov; Anna A. Smirnova; Maria V. Samuleeva; Evgeniy V. Ershov; Svetlana D. Buinitskaya; Alexander N. Kharitonov, Hooded Crows (Corvus cornix) May Be Aware of Their Own Body Size, 10.3389/fpsyg.2021.769397","index":417}