Figure 2.

Snapshots of reconstructed interactions of weakly electric fish. See Movie 2 for an animation. The current fish position is marked by filled circles. Trailing dots indicate the positions over the preceding 5 s. Individual fish are labeled by the same colors across all figures. Large transparent circles denote occurrence of chirps. Gray dots indicate electrode positions and light blue illustrates the water surface. The direction of water flow is from top to bottom. A, Courting female (orange) and male (purple) are engaged in intense chirping activity. An intruder male (red) lingers at a distance of ∼1 m. B, C, The courting male attacks (purple arrow) the intruder (B), who emits a series of chirps and leaves the recording area (C, red arrow) while the resident male resumes courting (C, purple arrow).