Question: To create a tracking and warning system for predators around bird feeders.

  Options: 
 A. Pour band below seeder after replenishing it. Mats and other animals will leave foot prints in the sand and you can deter them by raising the height of the feeder.
 B. Pour sand below the feeder after replenishing it. Cats and other animals will leave foot prints in the sand and you can deter them by raising the height of the feeder.
Answer: B