 "P. spiegeli", on the other hand, also consumed caddisflies (Trichoptera) in addition to moths.Most members of those insect families are active at night, giving a strong indication that "Palaeochiropteryx" were also nocturnal, or at best, active during twilight (crepuscular).From the results of radiographic analysis, "Palaeochiropteryx" (as well as "Archaeonycteris" and "Icaronycteris") all have enlarged cochleae relative to the size of their skulls.