How sure are we that Savs are Diurnal?

[formica]

I'm starting to think that perhaps they arnt, several times now, 3-4 locusts that where remaining in the enclosure at lights out, have all vanished by lights on in the morning, theres no way for them to escape the enclosure, although there are plenty of places for them to hide, but thats not really what locusts do during the day

I've often thought I'd heard noises coming from the enclosure at night, difficult to tell for sure when theres a small zoo in the room tho, and I dont have any IR cameras to setup and find out for sure

any thoughts?

Lghts go out on the enclosure at 9pm, I tend to either be working or watching TV in the room until 11/12ish, and theres definitly no activity during that time, my Sav is pretty noisy during the day when he's chasing food around - he could be eating them after I goto sleep I guess