Proportion of time spent foraging while in the wood shavings area for tests for which birds were successful across eight tests with increasing water runway length and depth for the three food treatments for a) means (±SE) estimated from LMM on angular scale and b) back transformed to the proportion of time spent foraging while in the wood shavings area.

<p>Proportion of time spent foraging while in the wood shavings area for tests for which birds were successful across eight tests with increasing water runway length and depth for the three food treatments for a) means (±SE) estimated from LMM on angular scale and b) back transformed to the proportion of time spent foraging while in the wood shavings area.