Transitive responding in hooded crows requires linearly ordered stimuli.
Olga F Lazareva, Anna A Smirnova, Maria S Bagozkaja, Zoya A Zorina, Vladimir V Rayevsky, and Edward A Wasserman
J Exp Anal Behav. 2004 July; 82(1): 1–19. doi: 10.1901/jeab.2004.82-1.PMCID: PMC1284988