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I have a G. pulchripes who does the same thing. She's otherwise fat and happy. She's been doing it for months with no apparent ill affect.
I think she's just trying to annoy me.
What's wrong with them is that they are a known intermediate host for a family of nematodes that are 100% fatal to tarantulas. This is why zoos (well, good zoos at least) keep T's in a separate area with the insects and away from snails and other gastropods. Other snail species also host these...
OK. Thanks.
I think you're way ahead of the time to worry. A "striped-knee" usually refers to the species Aphonopelma seemanni. (You should get used to using the species name. The common names vary dramatically across the world so when you say "striped-knee" nobody can really be certain what...
More info needed.
Species? Age? When was the last molt? Is it eating? Is it drinking?
I don't mean to be pessimistic, but sadly, if it is impacted there's a very poor prognosis. I've never heard of anyone actually saving a T once it gets bad enough to notice. Not to say that it hasn't...
I have an A. chalcodes that does the same thing. She even eats on top of her water dish. She'll grab a cricket and carry it over there like a raccoon. Who knows?
Totally agree with everything Trooper says.
Just wanted to add that T. verdezi normally doesn't dig deep burrows. In the wild they tend to prefer a silk-free dugout under a rock or log. They're more of an "artist's studio" than a "Palace of Versailles" type of spider.
If your T is digging deep...
T's may eat some prey all the way to the last nibble. With other types they may leaves the bones.
My A. seemanni doesn't leave any evidence of crickets except for the occasional poop spot on the glass. For roaches, though, she just sucks out the tasty filling and leaves the crunchy shell for me...
An oscillating tool works wonders if you happen to have one.
In the lab I use an oscillating bone saw that we "borrowed" from veterinary surgery (don't tell them where it went). It does an amazing job on soft materials like cork. Nothing like having a five-thousand-dollar tool for a fifty-cent job!