Archive for Tag: cause and effect

Thursday, October 9, 2014

A Howling Good Cause and Effect Lesson

TamaraJonesBy Tamara Jones
EAL Instructor, British School of Brussels
jonestamara@hotmail.com

Did you know that wolves can actually change rivers?

I didn’t, until I came across a great “Sustainable Man” video clip that one of my friends had posted on Facebook. According to the video, wolves were reintroduced to Yellowstone National Park in 1995 after having been absent for some 70 years. Since there had been no wolves to control the population of deer, it had pretty much exploded and the deer had eaten a great deal of the vegetation in the park. When the wolves were reintroduced, they killed some of the deer and pushed many of the others out of valleys and gorges.

Predictably, with some of the deer gone, the vegetation grew back in those areas, which attracted animals such as beavers, whose dams create habitats for other animals. Also, the wolves hunted the coyotes. When their numbers diminished, the species that they feed on also returned. As a result, the eagles, hawks and bears had more food and returned in greater numbers, too.

But, the most amazing result of the wolves’ return to Yellowstone National Park has been (and this is where the narrator gets really excited) that the trees have regrown along the banks of the rivers and

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