Ma'anar ƙamus na kalmar "fossorial mammal" yana nufin nau'in dabbobi masu shayarwa wanda ya dace da tono da rayuwa a cikin burrows ko karkashin kasa. Waɗannan dabbobi masu shayarwa suna da halaye na zahiri waɗanda ke taimaka musu yin hakowa da kewaya cikin ƙasa, kamar ƙaƙƙarfan gaɓoɓin gaba da farata, ingantaccen sifar jiki, da daidaitawar hankali don ƙananan haske ko yanayin ƙasa. Misalai na dabbobi masu shayarwa sun haɗa da moles, shrews, da wasu rodents.