I hate to bring an old thread out of the shadows but for anybody who's looking for information on feeding spanish moss to bunnies, I found out that people used to use it as horse forage back in the day. People's horses also view it as not only treats but forage these days as well and it's not toxic or poisonous to them - humans can also eat the green growing tips. There's been no mention of spanish moss causing anything bad in horses or humans that I'm aware of since I bet humans wouldn't wanna touch that with a ten-foot pole if it did cause problems, short-term or long term ;p lol
I've started feeding it to the to-be-culled bunnies to see how they react to it, first in smaller amounts then in growing quantities and they go BONKERS for it! Their poop is also okay and none of them are showing signs or symptoms of discomfort, they just want more, greedy bunnies. It's also GREAT nesting material.