iD magazine - - Nature -

A hi­er­ar­chy pre­vails in rab­bit war­rens. An al­pha male and an al­pha fe­male are the lead­ers of the group. Re­searchers have found that the an­i­mals at the very bot­tom of this hi­er­ar­chy have poorer im­mune sys­tems than the rest.

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