In search for the “missing links” of queer posthumanist discourses, some nonhuman animals play a crucial role in setting up new possible ontologies of sexual diversity. However, the desire to trace “natural” evidence for sexual diversity and a non-binary gender system that goes beyond the simplistic “social constructionism” vs. “biological essentialism” dichotomy in the nonhuman world should be critically examined. In this article I analyze both the scientific and popular representations of “wild and weird” nonhuman animals that became rich semiotic-material (...) referents to human sexuality and gender diversity in order to propose “transpecies intimacies” as a strategy for overcoming the deadlock present in naturalizing and essentializing discourses. This essay focuses on the case of the spotted hyena, because this nonhuman animal functions as an important signifier and material resource for sexual differences on multiple levels of power relations – institutional, scientific, educational, somatic, discursive, and even affective. I consider how biomedical narratives on sexualized nonhuman animals employ hegemonic economies of sexual difference to build stories of a naturalized sexuality and an embodied gender difference wherein some chemical substances, like hormones, and some body parts, like genitals, serve as primary actors in this semiotic-material system. (shrink)