Concept:The shape of a bird’s beak is closely linked to its feeding habit.
A long, slender, and pointed beak is typical of nectar-feeding birds.
Explanation:Look carefully at the structure shown in the image.
The beak is narrow, elongated, and tubular in appearance.
Such a beak can reach deep into flowers to collect nectar.
It is also useful for probing into crevices for insects.
This type of beak is not strong or chisel-like, so it cannot peck wood or grass.
It is not hooked or sharp enough for killing fish.
Therefore, the beak is specially adapted for sucking nectar from flowers.
Birds like hummingbirds possess this exact beak structure.
Answer:D. sucking nectar
