What it looks like
Boluses are often small dark or pale pellets, sometimes wrapped in silk. Their appearance varies with prey type and can be mistaken for faeces or a dead feeder.
When to remove it
Remove accessible boluses during routine spot cleaning, especially if they stay damp or begin to mould.
Do not destroy the retreat
If a bolus is woven deep into a secure burrow or web retreat, leave it until it can be removed without tearing the enclosure apart unless it is causing a clear hygiene problem.
Tools
Use long forceps and know where the spider is before reaching into the enclosure.