 They also face predation and competition from introduced species such as dogs and cats.Another threat, though less severe than with the four Australian species of "Dasyurus", is poisoning by bufotoxins from the introduced cane toad ("Rhinella marina", formerly "Bufo marinus").Because they have evolved consistently isolated from toads since the Jurassic, all dasyurids possess extremely low resistance to toad toxins, and whilst smaller dasyurids usually do develop conditioned taste aversion to toads, there is little evidence for this in quolls.