{"fact":"Not all crows passed the mirror test, showing even within a smart species, there are different levels of ability.","context":"Although two of six birds that we tested did not respond to mark test, we would strongly argue that crows possessed the ability of self recognition. In fact, there exists individual variation in the cognitive skills and performance, perhaps because of individual differences in the neural processing (Boogert et al. 2018).","source":"Amaan Buniyaadi; S. K. Tahajjul Taufique; Vinod Kumar, Self-recognition in corvids: evidence from the mirror-mark test in Indian house crows (Corvus splendens), 10.1007/s10336-019-01730-2","index":375}