The field of Human-Animal Studies (HAS) is about human-animal relations. However, which nonhuman animals does the field encompass? In recent years, some scholars have noted a bias towards vertebrate species, especially domesticated mammals. To assess how prevalent (or not) invertebrates have been in HAS scholarship, a three-stage scoping study was conducted of two pioneering journals in the field: Anthrozoös and Society & Animals. This article reports on preliminary findings and confirms that human-animal scholarship, as presented in these two leading journals, is characterized by “institutional vertebratism,” albeit the extent of this invertebrate knowledge gap needs to be fully assessed. If the next generation of HAS scholars are to comprehend the extensive range of interspecies contexts, they must be more inclusive in terms of the diversity of animal species studied. Widening the species net is therefore a necessary corrective to address vertebrate bias in this field.