Best Ground Squirrel trap around. When one goes in they all want to! So far the record is 28 squirrels in one day! I have never seen a trap as effective as this one for ground squirrels! The inventor of this trap has evolved the design over the years to ensure the best catch. Unlike other cheaper models, the Black Fox Trap has the patented spring doors. This allows faster loading and higher numbers of catches per trapping session. Absolutely the best!