Fraction of bird species for which the model included vegetation variables as the first (V1), second (V2) or third (V3) most important variables.

Species are grouped by their degree of habitat specialization based on the number of habitat types they use for breeding and feeding. High specialization means the species use one habitat type (N = 90), mid specialization means the species use two habitat types (N = 51) and low specialization means the species use three habitat types (N = 9).