Which description best matches the bill of finches?

Which description best matches the bill of finches?

• A. Long curved bills for catching fish.
• B. Flat broad bills for sifting seeds.
• C. Short stout bills for cracking seeds.
• D. Sharp hooked bills used for breaking seeds open to eat.

Answer: (D)

Beak shape mirrors feeding style. Finches rely on seeds with tough shells, so they have short, stout, conical beaks that can apply strong crushing pressure to crack open seeds and get at the nutritious insides. The other descriptions don’t fit: a long curved bill is typical of fish-eaters, a flat broad bill suits filtering or sifting, and a sharp hooked bill is used for tearing flesh. Thus, the beak best matching finches is the short, stout conical form for cracking seeds.