What are those caterpillar looking things in my crickets for reptiles.?

Jason

New member
today i brought a tub of small crickets to feed my leopard gecko, lots of crickets, but these black worm/caterpillar like things running around big and really small ones, also there are these black beatles every time you open the pot they fly round the room and you have to catch them, now i have put them in a seperate pot so i dont have to chase them. So what are the worm things and the beatles. in my tub full of small crickets.
are they safe to feed to the gecko

thanks.
 
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