Figure 9.19 Good genes. In the gray treefrog, females who chose long-calling males produced offspring that spent more of their time eating than did the offspring of short-calling males, regardless of whether predators were present or absent. Error bars are standard errors.
Data from G. V. Doty and A. M. Welch, Advertisement call duration indicates good genes for offspring feeding rate in gray treefrogs, Behavioral Ecology and Sociobiology 49 (2001): 150–156.