It would be convenient and powerful to be able to list multiple taxa under an observation field. Currently, an observation field can only be added once, and can only have one value.
To annotate this owl pellet with the three species found within it, I had to add three separate observation (and different) fields.
Multiple-species interactions are certainly a minority of iNat observations, but I believe they are a crucially useful component of iNat data. While museum specimens can reliably document historical range and morphology, those collections do not provide a record of how species interact.