This is the entrance to my Theraphosa apophysis’ burrow. It’s gone to ground to moult. This species possesses the most irritating urticating setae (specialised itchy hairs used for defense against predators etc) of all known tarantulas. 
The spider has burrowed down in such a way that I have a window into its moult chamber. The whole thing is lined with silk, but most amazing of all is the protective measure it has taken to deter any would be attackers from disturbing it while it’s in its most vulnerable state.
See all that fluffy debris all over the spider (who is upside down here)? Those are its urticating setae. Prior to beginning its moult, it kicked them all over its silken moult mat & when it flipped on to its back, the result was it being covered in these hairs.
Any time this spider flicks hairs at me, I get immediate pinprick blisters wherever they land that are intensely itchy. The only thing that relieves it is to wipe my skin down with alcohol, apply hydrocortisone & take an antihistamine. So this is a very effective measure!
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