What makes Mac's humane live animal trap a popular sharable?

The trap - which cages the animal for release elsewhere -- is out on loan again. This time for on a two week rental to catch a squirrel that is believed to be making a nest in a family's attic.

The rental cost of $5 a week seems to compare favourably to the cost of stopping up all the holes in the house and a return visit by a pest remover.