Table 2 Three top-weighted models explaining median T _air values in wing-drooping behaviour (wing ₅₀) using both generalized linear models (GLS) and phylogenetic independent analyses (PGLS). The global model included: log₁₀ body mass (log₁₀ M _b); proportion of observations where birds were mobile (prop_act), and exposed to full sun (prop_sun) at air temperatures between 35 and 40 °C (see methods for details); drinking dependency; foraging location; and diet as independent variables. Only the variables that were influential in the three top weighted models are shown. For each variable we provide the contrast (± standard error), and significance level (see footnote below Table)

From: Behavioural responses to heat in desert birds: implications for predicting vulnerability to climate warming