helium

Helium-filled balloons are attractive until they are released into the air because they will not fly forever but will blow out or burst when the pressure changes and must fall to the ground once. They often end up in the wild where animals find them, eat them and die because the balloon blocks their digestive tract. They often suffocate after being entangled in ribbons attached to balloons. So DO NOT RELEASE BALLOONS!

Why I don't use helium