Why do yellow birds always peck at grass nests?

Yellow birds peck grass to build nests.

Yellow birds are common birds. They usually build and tidy their nests in spring. Grass nest is one of the most commonly used nest materials for yellow birds, because grass is soft and easy to collect, which can provide good insulation effect. Yellow birds will weave grass leaves into nests by pecking to adapt to the climate change and reproductive needs in different seasons.

In addition, the yellow bird will also lay feathers, bark and other substances in the nest to increase comfort. Generally speaking, yellow birds peck grass to build nests, which is their instinctive behavior to protect and reproduce.