The evaluation will then incur a response of some sort. In other words, before an animal engages with a potential mate, they first evaluate various aspects of that mate which are indicative of quality-such as the resources or phenotypes they have-and evaluate whether or not those particular trait(s) are somehow beneficial to them. It is characterized by a "selective response by animals to particular stimuli" which can be observed as behavior. Mate choice is one of the primary mechanisms under which evolution can occur. Here, black grouse males gather in a quagmire and the females then arrive and observe the male before choosing one. Mate choice is highly visible in lek mating.
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