{"fact":"Scientists have located a brain region in crows, called the nidopallium caudolaterale (NCL), that is very active when the birds are using abstract rules, making it a key area for crow intelligence.","context":"We recorded single-cell activity of 336 neurons in the NCL of the endbrain of the two trained carrion crows (Fig. 4a–c).","source":"Lena Veit; Andreas Nieder, Abstract rule neurons in the endbrain support intelligent behaviour in corvid songbirds, 10.1038/ncomms3878","index":214}