There are currently no published studies examining taxonomic bias on Instagram. To address this knowledge gap, this study examined seven popular science communication accounts for a year and found that the majority of posts featured vertebrates. However, non-insect invertebrates attracted the highest measures of positive audience engagement (likes, views and comments), suggesting a mismatch between the preferences of science-seeking audiences online and the information being offered to them. These results challenge traditional notions of charismatic megafauna and could improve conservation outcomes of traditionally under-represented species like invertebrates.