The robocalypse is already happening ... if you're a zebrafish. Researchers at the Polytechnic Insitute of New York University and Istituto Superiore di Sanità, Italy, have created an artificial fertile female zebrafish that was accepted as a new robotic overlord by the real fishies:
The team fashioned their robotic fish to look like a fertile female zebrafish, which is attractive to both males and females in the species, and they painted it with characteristic stripes and yellow accents. [...] When the robotic fish with flapping tail was adjacent to an empty control section, both individuals and small shoals of zebrafish preferred to spend time in the vicinity of the robotic fish. In other words, fish were attracted by the robot.