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(a) Proportion of time spent by H. unicolor tracking its putative model, the foureye butterflyfish (C. capistratus). (b) Proportion of predatory strikes performed by H. unicolor while tracking C. capistratus versus while swimming alone. Hypoplectrus puella served as the control for both analyses. Means±s.e., dashed lines: medians, n=12 observations of 45–60 min for each species. Inset: H. unicolor (above) and C. capistratus (below).
