Comparing Maps
Robins, Rainfall, and Human Populations

Why does it seem like there are more robins in areas with higher precipitation and more humans? Think about what robins need to survive!

  • Moderate rainfall (and melted snow) makes it possible for robins to find food. Rain makes fruit trees grow. It also softens the soil so robins can more easily pull out worms.

  • One reason the robin reports show up where lots of people live is that there are more people to notice them. BUT, more important, people provide many habitat features that robins need. Can you think of some examples? (See answer below.)

Answer: People plant fruit trees, grow lawns, water gardens, put out birdbaths, and plant trees and bushes that provide shelter and nesting sites.

Did you know?
Earthworms that were native to the United States were wiped out by glaciers during the last ice age. But early American colonists later brought earthworms (and their egg cases) over from Europe — without even knowing it. These creatures and eggs were hidden in plants and in the rocks and soil that was used to help balance the weight of ships!