Balloon animal

Balloon animals were encountered during the Prison random event. Players pulled the lever besides the barriers to get an image of the balloon animal that they are supposed to pop. Players then popped at the least three of these to obtain the prison keys inside them. In this random event you did not get an emote nor a costume.

The varying characteristics between each balloon animal can be easily distinguished from their horns, body width, and tail length.

There's also a chance that an animal may escape through the door, but that is extremely rare. Today they can be found tormenting Prison Pete at the prison in Port Sarim.

Trivia

 * On 25 May 2011 the size of the balloon animals was increased drastically, to make them easier to see and click.
 * At RuneFest 2011, several Jagex Moderators spawned balloon animals at the Grand Exchange as part of a demonstration of how the Rotten potato works.