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 also eat other small insects, berries, fallen fruits, and especially Rosaceae fruit in the fall and winter. Robins cannot digest hard fruits or grains, so they stick to soft fruits and organisms with softer skeletons (Howell, 1942). http://www.bio.davidson.edu/people/vecas...
A. The main predators of robin eggs are snakes, squirrels, blue jays, and crows. (Deer eat a lot of bird eggs and nestlings, too, but only from ground nests.) Snakes swallow eggs on the spot, and since you found one egg in another part of the yard, a snake most certainly wasn't the culprit.