Wrth ystyried sut i fynd ar drywydd hyn ar wahân yng Nghymru, comisiynais yr Athro Stephen Harris, sef Ail Athro Coffa'r Arglwydd Dulverton yn y Gwyddorau Amgylcheddol ym Mhrifysgol Bryste, i gynnal adolygiad annibynnol o’r dystiolaeth fyd-eang o les, corfforol a meddyliol, anifeiliaid gwyllt ac/neu anifeiliaid annomestig mewn syrcasau teithiol a'r rhai nad ydynt yn teithio. Ystyriodd hefyd gyfoethogiad amgylcheddol anifeiliaid o'r fath a'u hymddygiad.
In considering how to take this matter forward separately in Wales, I commissioned Professor Stephen Harris, 2nd Lord Dulverton Memorial Professor of Environmental Sciences at Bristol University, to undertake an independent review on the worldwide evidence of animal welfare, both physical and mental, of wild and/or non-domesticated animals in travelling and non-travelling circuses. He also considered the environmental enrichment of such animals and their behaviours.