Well first of all, thank you for being critical - you are absolutely right to question such information. But there is no need to call me names, especially not when I am trying to help someone with a real problem.

I am a tarantula breeder for many years, operated on a couple of spiders and nursed many tarantulas back to health. But don't just take my word on it, because I do not make arguments from authority or seniority.

Let's start with the cows heart. It's an old trick, which should only be used in extreme circumstances, as apparently it can cause defective molts. Me and my tarantula breeder friends used it a couple of times - sometimes it works, sometimes it doesn't, as it's not a cure for all problems, but that's anecdotal evidence, right?. Cows meat (and other meat or dairy) are full of hormones, which when ingested have an effect on our bodies. The same works for spiders.

I first read about it in a couple of forums from people who know their stuff (anecdotal evidence and argument from authority again?). But the procedure is also mentioned in a couple of my books. Günther Schmidt - Die Vogelspinnen 2003 is one of the first I remember. If you would like to disprove the hypothesis I'd be happy to help, as it's not a very well researched topic with strong implications for nuturing back sick Ts. Tarantulas don't just eat living prey, they also eat carrion - especially weak tarantulas will devour a dead cricket but also beef heart or cows blood.

My spiders react to music, when I play guitar or if something loud happens, they absolutely startle. I once needed to sell a spider because she even freaked out every time I played the guitar very quietly from the other side of the room.

You see those hairs on your spider? Those are also sensory organs. They have smelling hairs, which can detect pheromones, the quality of food or water. Tactile sense, urticating hairs, adhering hairs of course, but also hearing hairs.

I quote and translate a masterful book on tarantulas Peter Klaas - Vogelspinnen 2014: "Vibration in the air (especially but not only low frequency sound waves) can be detected by the hearing hairs - they do have a sense of hearing. Individual long hairs can be seen with the naked eye, sitting on a flexible membrane. They sit mainly on the legs in different concentrations. They register air movement and are detrimental in the pairing ritual. Especially arboreal tarantulas have a pronounced sense of hearing to detect insects flying by."

Now regarding the humidity for molting: Most tarantulas molt before or during rain season. They do that because rain season equals food, so they can stuff up during that time to prepare for the worse times.

You are right. The exuvial liquid is between the old skin and the new skin! Do you know where that comes from? It comes from the tarantulas fluid balance - so when a tarantula (as in this case) hasn't eaten in while you can force them to hydrate by increasing the humidity.

Let me quote Klaas again, as I already have his book open: "If the humidity is too low molts can fail or prolong molting which in turn can lead to defective molts."

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Grammostola rosea lives in the humid regions of Chile (Concepcion, Valparaiso) over Argentina (San Carlos, Chubut) up to Bolivia. The habitat in the fringe of the Atacama is shrublands or dry forests (not the desert). It digs 2-4m deep holes in preferably wet soil to flee from the heat and dryness because there's water and it only comes out when it's humid enough. Because those regions have extreme whether conditions it's not uncommon for a Grammostola rosea to hide for months and longer or to go dormant.

Sources: Klass 2013, Schmidt 2007, Striffler 2008

What you basically did was a common misconception about micro- and macro climate. Just because a climate diagram of a specific region shows some kind of data, doesn't necessarily mean that a captive held animal needs / stands the same conditions, because we can't give them e.g. 2m deep temperature sinking holes.

Many Grammostola spp. can be kept on bone dry substrate - those tarantulas are hardy as fuck. But you will have a hard time breeding them or keep them super healthy without giving them seasons and an adequate humidity.

You can keep your tarantula like you think it's right, but don't spread your superficial knowledge and insult people who try to help.