The study was trying to capture the effects of urbanization on wildlife. They had two separate humans threaten a nest of mockingbirds. The first human threatened the nest for 4 consecutive days and the second human only threatened it on the 5 th day. The birds responded by keeping a greater distance from the human that attacked it in the beginning. The birds also had many warning calls to the other birds in the habitat. On the 5 th day rather the birds still flew away but not as far on the 4 th day with the other human. The birds warning calls also decreased on the 5 th day as well. This study showed that mockingbirds can identify a particular human out of many others due to the fact they posed a threat to them. This experiment was not a double-blind experiment because the experimenter knew what human was going to threaten the nests, but the birds did not know. If it were double blind neither the subject nor the experimenter would have known which human was going to threaten the bird’s habitat. The control
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