THIS JUST IN!!! According to this article in the NY Times, baby chickens place numbers on an mental number line. Just like humans do. And according to this article, that line may be hardwired in, and runs from left to right. Just like in us humans. Except for those humans in those parts of the world that read right to left. Although they leave it somewhat unclear as to whether chicks in those parts of the world are wired like their western cousins, or follow the lead of the more local daily papers.