This is a controversial topic .... Whe I started I was told to place card / cardboard down first and feed over the top of the card - just to avoid any swallowing / ingestion of the substrate as it can supposedly lead to impaction .
That's what I've done for years with no issues .
Maybe it depends on the type / size of the snake /substrate and how much they swallow . I've seen odd pieces occasionally stuck to the rat when they're munching on it and I've pulled the bark off with tongs .
It will be intersecting to see what the others think.
Some snakes will never see anything like apsen or bark chippings in the wild like sand boas maybe ...
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