I've heard this too. I think its sodium bicardonate (baking powder) that your supposed to use. I've heard theoretically it can work, since the powder expands in the stomach when mixed with the stomach acid of the pigeon. I don't think it would work though unless you poured loads down the pigeons throat, otherwise it just make the pigeon feel really sick. It's cruel, don't try it.
When I lived in Virginia Beach, there was always someone trying to feed the birds alka selzers, suppose to make them blow up, although I never wanted to see it, so wouldn't watch, all I know is there always seemed to be a lot of feathers around. now why would you want to blow up a pigeon?
Try putting raw rice out. If a bird eats this then they explode tried it myself about 100 times do you know if it works on dogs?
Any body try bread soaked in drano?
People blow up billions of pigeons everyday with shotguns after they are flung high into the sky..the british and english really like this game...and pigeons are taken advantage of everyday by the lottery and the games of chance in vegas...pigeons we're really useful to trap and tie tiny pieces of paper to their legs with notes written on them to carry them through war zones in the past...and cats really like to rip them apart when they catch them off guard...but if you really want a pigeon to blow up you fill them up with hydrogen and then light a match.... Or give them one of those new candy bars that fill up your stomach so you won't eat so much and watch them swell up until they pop like a balloon... Or let them drink a can of red bull....we had a guy from vietnam that use to eat them like chicken. We never had to worry about any pigeons flying around in the wharehouse..except you had to remember not to put your food in the fridge because he would put the pigeons he shot in the fridge to keep them until he could pluck them and cook them.ewwwwwwwwwwwwwwww!
No... But I dissected one I found dead in my garden with a stick when I was a kid... Gross!