Actually human urine has uses other than fertilizer. Many people use it to 'mark off' and area that they want wildlife to stay out of. I.E.: Animals such as deer, rabbits or squirrels tend to stay away from the gardens marked off in such a way
I have trouble with squirrels munching on some of my newer, (or even certain species) of plants, and it seems to work if replaced every couple of weeks or more often it we get a good rain...