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In page Guinea pig:

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Like many rodents, guinea pigs sometimes participate in social grooming and regularly self-groom.[6] A milky-white substance is secreted from their eyes and rubbed into the hair during the grooming process.[7] Groups of boars often chew each other's hair, but this is a method of establishing hierarchy within a group, rather than a social gesture.[5] Dominance is also established through biting (especially of the ears), piloerection, aggressive noises, head thrusts, and leaping attacks.[8] Non-sexual simulated mounting for dominance is also common among same-sex groups.[citation needed]