Id avoid having anything around that could poop on the dress or guests! I would be nervous with birds!
I was a guest at a wedding that did a butterfly release, and it was AWFUL! They were handed out in little packets, and a bridesmaid decided that it was to be a "surprise" (not to self, live creatures make bad surprises) It was UGLY!
They were handed out in little packets that came with the programs, and we were told, its a surprise, dont open until the end of the ceremony! It was a long ceremony! People did with the little packets the same thing they did with the programs, stuff them in your pockets, twirl them and stuff em in a purse, toss em on the seat next to you OOPS someone sits on them. Give em to the kids to hold.
Anyway, long story short, imagine a small child sitting next to you twirling the programs, then learning there is a butterfly inside, and that he squished it. Bloodcurdling scream ensues, people start digging out the surprise packets, butterfly casualties were high. It was not pretty! When the packets opened, little bugs FELL out onto the ground, some twitched, a few survived. TO THIS DAY I wonder, why did the people that supplied the butterflies not give clear instructions???? Why were they handed out at the beginning? It was a failure on so many levels....
SOOOOOO stick with the petals! lol