Why is the robins egg greenish-blue in color?
I would think that it would be safer from predators if it were not such an unusual color. A: Actually greenish-blue is similar to the color of some leaves, especially of the spruce trees that robins often use for building their first nest of the year. Perhaps the color is used for camouflage. Q: Can robins anticipate an early autumn and return to their wintering grounds earlier than normal? A: Robin migration seems to coincide with the time when berries are very abundant, perhaps so that they can feed along the way. They move faster when we get high-pressure systems with cold fronts. The last half of September, 1988, there were a lot of rainy days, which kept robins from flying much. It cleared up on October 1, and that morning I counted 62,707 robins flying along the north shore of Lake Superior. They had all been waiting until conditions were right for moving. Can they predict the future? I have a very hard time imagining how they could. But no one really knows for absolute certain–
