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Alien Invaders



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Eating the Enemy
Photograph by Melissa Farlow

A woolly herd eats its fill of flowering leafy spurge in a North Dakota pasture. Spurge-loving sheep and goats are an important part of a pest-management strategy that has effectively halted the spread of this invasive plant in the state. Ranchers also use herbicides and a type of beetle that eats nothing but spurge, although some think sheep are by far the most effective control measure. Still, spurge covers vast stretches of the state—an estimated 1.2 million acres (0.5 million hectares).

Photo Fast Facts

Weather Conditions: Warm, cloudy
Time of Day: Sunset
Lighting Techniques: Available light
Weather Conditions: Crisp, sunny
Time of Day: One hour after sunrise
Lighting Techniques: Available light


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