Figure 3.

Pairing patterns in relation to beak morphology of 759 G. fortis pairs (circles) and 32 G. magnirostris pairs (diamonds). Members of the family of large birds are indicated by crosses. The average of the beak depths of the two known females has been used for the two unknown females (see text). The total dataset for the years 1976–2007 has been used. Three male G. fortis with large beaks were paired with a total of 10 females with beaks of average size in the years up to but not beyond 1994.