haramiyids seem to have generally been herbivorous or omnivorous, possibly the first mammalian herbivores; however, the sole haramiyid tested in a study involving mesozoic mammal dietary habits, "haramiyavia", ranks among insectivorous species. at least some species were very good climbers and were similar to modern day squirrels; and several others have more recently been reassessed as possibly arboreal. general arboreal habits might explain their rarity in the fossil record.