Even though I know what random selection, directional selection, stabilizing selection, disruptive selection and sexual selection are I can not understant what does Starlings producing five eggs in each clutch has to do with it.

In my final I got this question and I don't know if I got it right because I had to guess. The question said something like "starlings produce five or six eggs (I don't remember the exact number) in each clutch and I was supposed to say which type of selection (random,directional, etc..) was that. Please tell me why will any of those answers make sense.

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describe the evolutionary basis for behavioral ecology. Explain why these adaptations may result in suboptimal behavior.