A study by the University of Santiago de Compostela has found that parasites known as oestrids, which are common in sheep and goats, are also affecting roe deer in central Spain. The research, which analyzed 184 roe deer, found that 23.9% had different stages of oestrids larvae, with the roe deer nose fly (Cephenemyia stimulator) and sheep nose fly (Oestrus ovis) being the most prevalent. The study highlighted significant variations in the prevalence and intensity of these parasites across different provinces, suggesting an irregular distribution. The high incidence of O. ovis in roe deer, along with its proximity to small ruminants, raises concerns about potential cross infestations and completions of its biological cycle in deer. The researchers suggest that controlling oestrids in sheep and goats could help mitigate nasal myiasis in wild ruminants.