pests

Baltimore's seaport is a world of big, noisy steel machines: giant cargo ships, cranes and roaring trucks.

In the middle of this hubbub, David Ng, an agricultural specialist with U.S. Customs and Border Protection, tries to find things that are small and alive: snails, moths and weed seeds of all sorts.

A slug snacking.
Christine Majul / Flickr

The rain brings out the snails and slugs. Dan Gill explains how to trap them in your garden.