{"fact":"When faced with a really tough puzzle, some crows might get a little stressed and repeatedly choose the same string, even if it's not the right one.","context":"Stereotypical activity expressed as preference for the string on a particular side was regarded as a measure of neurosis-like behavior in the birds, mainly apparent during solution of very complex tasks.","source":"M. S. Bagotskaya; A. A. Smirnova; Z. A. Zorina, Corvidae Can Understand Logical Structure in Baited String-Pulling Tasks, 10.1007/s11055-011-9529-z","index":437}