A model originally applied to one form of this behavior includes a parameter a that represents searching efficiency and was developed by Nicholson and Bailey. Instances of one form of this behavior are more likely to occur between closely related species according (10[1])to Emery’s (-5[1])rule. (10[1]-5[1])A namesake (-5[1])form of castration and micropredation (10[1])are two of the six major strategies of this behavior. (10[2]-5[2])Sexual reproduction (10[1]-5[1])may have evolved as a response (10[1])to this (10[1])behavior (10[1]-5[1])according (10[1])to the Red Queen (10[2])hypothesis. (10[2]-5[2])The (-5[1])mafia (10[1]-5[2])hypothesis (-5[2])proposes that (10[1])threat of retaliation leads to acceptance of cuckoos laying their eggs (10[3])in other nests, (10[4]-5[1])which is a classic (-5[1])example (10[1])of this behavior’s (10[7])“brood” form. (10[1])For 10 points, (10[1])name this (10[2])form of symbiosis in which the namesake organism benefits at the expense of its host. (10[4])■END■ (10[10])