Plastic barrel mineral feeder

[Jeanne - Simme Valley]

If you hang it too close to the tree or post, the cattle (especially a bull) will "trap" it and either "mush" it or use it to push it staight up in the air & dump the mineral out.
Macho is wicked bad with them.

 

[dj]

another variation

 

[Beef11]

I like the last cause both of the trees around here are in someone elses pasture.