Australia's punishing climate has made invasive cane toads tougher than their country of origin counterparts, a University of Sydney study has found and are likely to spread "everywhere" across the country.

PhD candidate Georgia Kosmala sat inside an "oversized fridge" and recorded the stamina and temperature adaptability of cane toads from native populations in Brazil and invasive populations in Hawaii and Australia.

First Queensland, then Australia. The cane toads are on the march.

Ms Kosmala said the Aussie battlers performed better than their native South American counterparts.

"We had a circular track and that was put in a temperature control room...that fit the track, me and the toads," she said.