An American killifish, often seen at the water surface.
- Fundulus and other genera in the families Cyprinodontidae (or Fundulidae) (many species), and Poeciliidae (one or two species).
- The males are less responsive to non-threatening fish like topminnows (family Fundulidae).
- One form of aggressive behavior is dominance hierarchies, which are found in many groups (e.g. catfishes, minnows, cods, ricefishes, topminnows, cichlids, wrasses, blennies, and boxfishes).
- The Gila topminnow historically occurred throughout the Gila River drainage in Arizona, and even into New Mexico and Mexico.
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