A parasite-prone peacock, for example, is more likely to be discovered by a discerning peahen because parasite infestation demonstrates itself as damage to plumage (which is more noticeable given the peacock's bright coloration).
An appraisal is a judgment of something, especially an estimate of how much it's worth. Usually you need an expert to give an official appraisal. If you were selling a house, you'd need an expert in real estate to give an appraisal of how much it's worth â that's an official estimate of how much you could sell it for. But this word can also be used in other less formal situations that call for a judgment or opinion of some sort.
Appraisals are judgments of the characteristics, traits and performance of others. On the basis of these judgments we assess the worth or value of others and identify what is good or bad. In industry performance appraisal is a systematic evaluation of employees by supervisors. Employees also wish to know their position in the organization. Appraisals are essential for making many administrative decisions: selection, training, promotion, transfer, wage and salary administration etc.