It’s an hour after sunset on Maryland’s Eastern Shore.  Glenn Therres, a wildlife biologist and associate director at the Maryland Department of Natural Resources, is up to his usual Friday night routine: prowling the back roads in a pickup truck, surveying frogs.

<p>It&rsquo;s an hour after sunset on Maryland&rsquo;s Eastern Shore.&nbsp; Glenn Therres, a wildlife biologist and associate director at the Maryland Department of Natural Resources, is up to his usual Friday night routine: prowling the back roads in a pickup truck, surveying frogs.</p>

The Environment in Focus, hosted by Tom Pelton, is a weekly perspective on the issues and people changing our natural world.  Pelton is a national award-winning environmental journalist, author, and public radio host.

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