Background In Ethiopia, Ethnozoology and Zootherapeutic research is very limited and little attention has been given.The study was designed to investigate and document traditional knowledge associated with medicinal animals in West Gojjam Zone of Javitenan, North Achefer, and Bahir Dar Zuria districts.Methods Ethnozoological data were collected using structured questionnaires and use value (UV), informant consensus factor (ICF), fidelity level (FL), preferential ranking, and paired comparison were analyzed.Results A total of 26 animal species and were identified and recorded as a source medicine to treat 33 types of ailments. Animal derived medicines of Bos indicus , Trigona spp . and Apis mellifera were frequently reported species to treat various ailments. Bos indicus , Trigona spp ., Apis mellifera , Hyaenidae carnivora , and Labeobarbus spp . were the most frequent use value reports (84%, 52%, 43%, 37% and 36%) respectively. Informants reported 25 animal parts to treat ailments. Honey and meat took the highest frequency use report followed by purified butter, Milk, Liver, fatty meat and Cheese stored more than 7 year were described with average ICF value of 69%. Maximum degree of consensus was developed for remedy of evil eye (88%) followed by dry cough, swelling and hepatitis 82% each. Use of animal derived medicine from Liotrigona spp . used to relive dry-cough tend to have the highest FL (80%); followed by Labeobarbus spp . for swelling (33%) and Trigona spp . for dry-cough (30%). Paired comparisons revealed that purified butter > 2 year, Cheese > 7 year, honey of Liotrigona spp . (Yetinign Tazma), and honey of Trigona spp . (Tazma) were the most popular and efficacious animal-derived medicines to cure malaria and ranked 1st , 2nd , 3rd and 4th , respectively.Conclusion and recommendation results of this study recorded the most popular animal derived medicine to cure various ailments. Thus, government must strengthen traditional healers with training, club formation, material and financial support and improve means of protecting their intellectual property rights. Moreover, chemists and pharmacists should be undergo a detailed study to identify which chemical constituent of animal and animal product is responsible for the respective treatment of ailments in the study area.