- Large, strong beaks: Ground finches had robust beaks suited for cracking hard seeds.
- Short, stout beaks: Tree finches possessed shorter, thicker beaks ideal for breaking plant materials like stems and flowers.
- Curved, sharp beaks: Cactus finches evolved pointed, curved beaks to reach and grip insects deep inside cactus flowers.
- Long, thin beaks: Warbler finches developed narrow, elongated beaks to extract nectar from flowers.
- Generalist beaks: Insectivorous finches exhibited shorter, conical beaks for capturing soft-bodied insects.