Big Idea: Changing ecosystems are maintained by natural processes.

Bees are important for agriculture. But bee populations face threats. This resource looks at Colony Collapse Disorder, herbicides & pesticides, and more.

Scientists can observe birds to get useful information about the health of, and changes in, an ecosystem.

When fertilizers from agriculture get into lakes and rivers, big problems can result for aquatic ecosystems, food chains & webs!

Beavers are a Canadian symbol. But in South America, they’re considered an invasive species.

Wind power is a growing source of electricity generation. But wind projects often affect local wildlife populations, and researchers are using environmental monitoring techniques to alleviate some of these impacts.