Not so fast! When the robins got to their higher-altitude breeding grounds, it was snowy and wintry. In fact, the migrants arrived about 18 days before the bare ground showed.

Scientists think that a warming climate in the lower-altitude wintering grounds gives robins an early signal to migrate. But up in the Colorado Rockies, climate change seems to lead to heavier snows, NOT warmer temperatures! What does that mean for our feathered friends?

Douglas Triggs