Ewwww...I've read others talk about their chickens eating spiders. I don't know how much more venom a taran. has than a typical wolf spider??? Sorry, I'm no help, but I'm interested.... my guess is that they would be okay, but I'm such a "chicken" myself that I'd probably not allow it if possible to prevent it...
So how did it go? My ladies eat spiders all the time but I don't think we have tarantulas out here. Plenty of Black Widows though. They have no hesitation at all with moving things.