Activation energy is the amount of energy required to initiate a chemical reaction. The activation energy can be determined from reaction rate constants at different temperatures by the equation. ln(k 2 /k 1) = E a /R x (1/T 1 - 1/T 2).
Robins eat different types of food depending not only on the time of year, but even time of day. They eat earthworms early in the day and more fruit later in the day. Because they forage largely on lawns, they are vulnerable to pesticide poisoning and can be an important indicator of chemical pollution.
For the most part sparrows are seed eaters. The seeds that the sparrow will normally prefer are millet, grass, thistle, weed, and sunflower seed. Even though the sparrow is primarily a seed eater they will eat small insects, and are often seen in parking lots and parks where scraps of food are left about.