Balloon

Balloons are entities that float upward when placed.

When used on a mob, a fence, or a wall, balloons attach to the mob or block, similar to a lead. A balloon remains grounded if tied to a fence or a wall. When untied by right-clicking on it, a balloon rises into the air quickly.

When a balloon is shot by an arrow, wind charge, or a trident, or floats into a solid block, it pops, summons particles, and is destroyed. It drops nothing. A balloon tied to a fence post bursts when a player strikes it from any direction.