Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Bradysaurus shine kawai memba na ƙananan dangin Bradysaurinae. Yana da mafi kyawun sanannun pareiasaur kuma ana iya la'akari da kyakkyawan nau'in kakannin da wasu suka samo asali. Babban girmansa ya nuna cewa, tun da wuri a tarihin juyin halittarsu, waɗannan dabbobi masu ban mamaki sun riga sun kai girman da ya dace. Ko da daga baya, siffofin da suka ci gaba, kamar Scutosaurus, ba su da girma. Fa'idar girman girman shi ne don ba da kariya daga masu farauta da kuma kula da yanayin zafin jiki na jiki (gigantothermy).  Tambaya: Yaushe ne dabbobi suka kai girman da ya dace?
a farkon tarihin juyin halittarsu