Figure 6.

Index house finches exposed to one of three inoculation treatments (control, low-virulence strain or high-virulence strain of M. gallisepticum) varied significantly in the rate at which they pecked at food during peak infection, with index birds infected with the high-virulence strain of M. gallisepticum showing fewer pecks at food per second relative to uninfected controls during a foraging bout. Point colour represents each unique index bird (n = 8 for which we had video data); non-independence in repeated observations was controlled for in the analysis by including bird ID as random effect.