The article explains how and why blue jays migrate. Some blue jays choose to migrate and some choose to stay behind on their breeding grounds throughout winter. Not all blue jays head south to a warmer climate but not every single year.
This shows an example of problem solving from potential predictors. Pandas don't have a natural predator but have many ways to escape. They are very skilled when it comes to escaping. Pandas can bite extremely hard, climb very well, swim, and use their sheer size.
The article shows an example of mating selection/choice. the rolls are reversed for the species. The males choose between all the females. They prefer large-bodied females because it would yield a larger number of offspring.
The website goes over how komodo dragons hunt and what adaptations they have had to make. In general they are 100% carnivores and will eat anything they can over power. They also aren't shy of cannibalism and will eat smaller komodo dragons. Food is hard to find in the harsh environment and with their foraging habits, they have become the top predator.