Humans vs. animals: does anybody win?

You need a sale home, healthy food, and clean water to survive. So do other animals. Why care about the needs of a fish or butterfly or wild horse? "All different aspects of the natural world are connected," says biologist Jim Helfield. "We're just beginning to understand the impact of losing even one small part." How are human and animal needs interconnected, and how do they clash? Take this true/false quiz, then read the issue to learn more.

1 Human-built dams help wild salmon migrate more easily to and from the ocean.

True -- False --

2 Salmon help fertilize soil, which in turn make trees healthier--and that's good for the atmosphere.

True -- False --

3 Monarch butterflies hibernate in government- protected sanctuaries, in which no logging ever takes place.

True -- False --

4 Wild mustangs and ranchers' grazing cattle compete for the same land.

True -- False --

ANSWERS

1. false 2. true 3. false 4. true