Curated OER
Monarch Butterflies
Monarch butterflies are as fragile as they look and a small change of their environment could have a huge impact on their lives. Watch this video to learn about one instance where over 250 million monarch butterflies died.
Curated OER
Populations : Biotic Potential
Why do most populations remain stable over time? Usually it is a result of either environmental resistance or carrying capacity. Examine some of the factors that help stabilize animal populations, and explore some of the changes that...
California Academy of Science
Monarch Migration
It takes four generations of Monarch butterflies to complete the migratory path from the Rockies to Mexico each year, so how do they know where to go? The answer may surprise you; it certainly surprised the scientists who figured it out!...