Tanya and Saul saw one eat another one near Ground Zero--the one that was sniffing around their car, truck, whatever.
Most Behemoths seem anti-social; Skittles said the regulars avoided them because they'd eat other zombies from the get-go. Maybe it's because of who they were before (murderers, etc). I've also gotten the impression that they have to be really hungry before they'd eat each other. Maybe that's how the plague would eventually burn itself out--without Ink's help they'd eat each other until there were a manageable number,
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