Leaf-eating birds, a diverse group that includes parrots, pigeons, and hummingbirds, have evolved specialized beaks adapted for tearing and consuming foliage. These beaks typically feature sharp edges for slicing leaves, strong muscles for tearing, and a wide gape to accommodate large leaf fragments. These adaptations enable leaf-eaters to extract nutrients from tough, fibrous plant materials, forming a crucial part of the ecosystem by controlling plant growth and dispersing seeds.