# Interspecies Homosexual Bonds Observed Between Bull and Donkey Researchers document a reciprocal, long-term sexual and social relationship between two domesticated species. - **Source:** [Scientific American Content: Global](https://brifing.si/source/4f066134-e06d-4415-87ef-305e3dc2aba6) - **Published:** 2026-11-02 - **Topic:** [Business](https://brifing.si/c/business) - **Original article:** - **On Brifing:** https://brifing.si/s/745feada-dbf5-42bd-b084-8e1682427aa4 ## Unexpected Field Observation During a research trip in Ethiopia, ecologists Andr Beir o da Cruz and Martina Francesconi observed a bull and a male donkey engaging in sexual activity. Initially suspecting a mirage, the researchers identified a consistent, deep social bond between the two animals, named Achille and Patroclo, who graze on the same plateau. ## Reciprocal Social Dynamics The study, published in Current Biology, highlights that this interaction was not a random occurrence. Over four days of observation, the bull mounted the donkey 51 times. The relationship extended beyond sexual acts, as the pair frequently engaged in licking and rubbing, demonstrating a clear, reciprocal, and voluntary social connection between them. ## Selective Behavioral Patterns The donkey, Patroclo, displayed selective behavior by remaining receptive to Achille while showing aggression toward other bulls in the vicinity. This selectivity suggests that the bond is rooted in a specific social preference rather than mistaken identity or forced interaction, challenging existing assumptions about the nature of interspecies sexual behavior in animals. ## Limitations of Domesticated Subjects Vincent Savolainen of Imperial College London notes that while the case study is significant for documenting behavioral diversity, it remains limited. Because Achille and Patroclo are domesticated animals, their interactions may not accurately reflect the social traits or evolutionary patterns found among wild animal populations, requiring further study in natural habitats. ## Challenging Scientific Literature Current scientific literature often attributes interspecies sexual interactions to forced behavior, mistaken identity, or random chance. The researchers argue that this case provides a rare, documented example of a recurrent and reciprocal relationship. This evidence suggests that animal social and sexual behaviors are significantly more complex than previously understood by behavioral ecologists. ## Methodological Research Approach The researchers observed the animals for four days together and four days apart to establish a baseline for their interaction. By moving beyond the strict, narrow focus often seen in field research, the team was able to identify these complex social dynamics that might otherwise have been overlooked by traditional observational methods. ## Broader Implications for Ecology This study serves as a window into the complexities of same-sex and interspecies behaviors in the animal kingdom. Senior author Elisabetta Palagi suggests that such interactions might occur more frequently in nature than reported, provided researchers maintain an open perspective while conducting field observations to capture these nuanced, non-traditional social animal connections. ## Future Research Directions To advance the field of behavioral ecology, experts emphasize the need to study larger groups of wild animals. While Achille and Patroclo provide a compelling case study, establishing broader patterns requires moving beyond individual dyads. Future research must aim to determine if these social structures exist across diverse species in wild environments. ## Sources covering this story - https://www.scientificamerican.com/article/this-bull-and-donkey-show-interspecies-homosexual-bonds-can-run-deep/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._