 Kelley reported in 1948 that "within a seven year period, without propaganda and without regard to all possibilities... Zebu hybridization has extended from at least Rockhampton on the south, right along the coast to Townsville and thence to the Daintree River area.It appears to have leapt the Atherton Tableland but it has penetrated into Cape York Peninsula as far north as Coen.It has also penetrated the coastal range country behind Ingham and at Townsville has extended into the basaltic country above Charters Towers and Pentland.