Blow up a balloon. Deflate until it is about half the size. Then tie a knot in the balloon. Cut a length of string. Tie the centre of the string around the nozzle of the balloon. Turn the balloon ...

The strings tied to balloons can also get tangled around birds, asphyxiating them or tying them to one spot until they die of hunger. Some balloons are marketed as biodegradable but they can still ...