1. G. fortis has a beak that is between 8 and 12 mm long.
2. G. magnirostris has an average beak depth of roughly 18 mm.
3. Judging on the size of its beak, G. magnirostris probably eats the biggest, hardest seeds.
4. It's likely that Big Birds consume seeds that are bigger than those consumed by G. fortis and smaller than those consumed by G. magnirostris.
5. In the lower right quadrant of the graph, a bird with a very long, shallow beak (like a hummingbird) would be visible.
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