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Video stills of P2 and P7 pups in their home cage. (A) A P2 focal pup moves forward following contacts on its head left and head right; (B) 3.2 seconds later, the pup starts to dig in to the huddle, indicated by the extended rear limbs. (C) A P7 focal pup has been contacted on its head right; (D) 4.3 seconds later the pup has oriented right toward the contacts and starts to move in and around the huddle. In each still the focal pup is indicated by an asterisk (*).
