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This paper describes the implementation and evaluation of four reactive robot chemotaxis algorithms. If they are applicable, reactive algorithms can provide fast, simple and cost-effective solutions for robot control applications. As part of this evaluation a robot was developed that has sufficient resources to enable it to implement each of the chemotaxis algorithms. The robot has bilateral chemical sensors, an airflow sensor and tactile whiskers to detect obstacles. Chemotaxis algorithms observed in the bacterium E. coli, the silkworm moth Bombyx mori, and the dung beetle Geotrupes stercorarius were tested as well as a gradient-based algorithm. There are many potential applications for chemical sensing robots particularly in situations where animals such as sniffer dogs are currently used. These applications include locating victims of avalanches or earthquakes and detecting landmines. Robotic systems offer a …