"Roadway overpasses in Canada's Banff National Park allow bears and deer to safely cross roads. Readers also discover fish ladders and 'salmon cannons' in the U.S. Pacific Northwest, rope swings for monkeys in China, and colorful crab bridges in Australia"--
Zeb Hogan, a freshwater fish biologist, describes the largest of the freshwater fish, which spend most of their lives in a lake or river rather than in the salty water of the ocean (From page 17).