In recent months, I have acquired a number of new colubrids, most of whom are arboreal, and all of which were imported (as in wild caught) with an eye towards breeding, if I can get them to establish in captivity. Once mites are cleared up, and the snakes are stable, my next normal routine is deworming, since most WC animals come loaded with parasites. But I am hesitant, because I have heard mixed things about whether or not an arboreal snake *should* be de-wormed. There seems to be a very divided and divisive camp on this topic. There are many instances of animals dying after being given de-wormers. I am unclear as to why this is, though people against worming arboreal snakes tend to argue that they are more symbiotic with their gut fauna, and that if the snake is stabilized and healthy, the load will be self-regulating, and no threat to the animal, but losing them completely will kill it. I'm not sure if the toxicity of the drugs being used might be of interest as well, as Ivermectin is known to be a risk to many reptiles, not just turtles and chams, though it is in pretty widespread use for reptiles. Another consideration is that worms may not be limited to the digestive tract, meaning that oral de-wormers might not catch everything. My worry is that the only systemic that *I* know of is Ivermectin, and even the company than manufactures it recommends against injecting it (though some places still do this). I have used Panacur in the past to kill worms in the digestive tract, but I do not believe that drug is used systemically. I'm just wondering if anyone has experience with this particular subject. I do plan on discussing it at length with my vet once the mites are cleared up, and the snakes are eating, and ready to be de-wormed. Feeding was last night, and fecal is pending poop.